diff --git a/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/config.h b/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/config.h
index c1f360ed..5485809a 100644
--- a/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/config.h
+++ b/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/config.h
@@ -1,3 +1,18 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #pragma once
 
 #define CHARYBDIS_CONFIG_SYNC
diff --git a/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/keymap.c b/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/keymap.c
index 6354ed87..3483db90 100644
--- a/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/keymap.c
+++ b/keyboards/bastardkb/charybdis/3x5/keymaps/t4corun/keymap.c
@@ -1,3 +1,18 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include "t4corun.h"
 
 #define LAYOUT_cnano_wrapper(...) LAYOUT_charybdis_3x5(__VA_ARGS__)
diff --git a/keyboards/bluebell/swoop/keymaps/t4corun/config.h b/keyboards/bluebell/swoop/keymaps/t4corun/config.h
index 787ab082..e6813ab9 100644
--- a/keyboards/bluebell/swoop/keymaps/t4corun/config.h
+++ b/keyboards/bluebell/swoop/keymaps/t4corun/config.h
@@ -1,3 +1,18 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 //Having this makes the left side encoder act like the right side
 #undef EE_HANDS
 
diff --git a/keyboards/bluebell/swoop/keymaps/t4corun/keymap.c b/keyboards/bluebell/swoop/keymaps/t4corun/keymap.c
index bd1bd389..23a4f95f 100644
--- a/keyboards/bluebell/swoop/keymaps/t4corun/keymap.c
+++ b/keyboards/bluebell/swoop/keymaps/t4corun/keymap.c
@@ -1,3 +1,19 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
 #include "t4corun.h"
 
 #define LAYOUT_swoop_wrapper(...) LAYOUT_split_3x5_3(__VA_ARGS__)
diff --git a/keyboards/crkbd/keymaps/t4corun/config.h b/keyboards/crkbd/keymaps/t4corun/config.h
index 7b9637ef..c4fde037 100644
--- a/keyboards/crkbd/keymaps/t4corun/config.h
+++ b/keyboards/crkbd/keymaps/t4corun/config.h
@@ -1 +1,16 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #pragma once
\ No newline at end of file
diff --git a/keyboards/crkbd/keymaps/t4corun/keymap.c b/keyboards/crkbd/keymaps/t4corun/keymap.c
index 097ce3ad..833281aa 100644
--- a/keyboards/crkbd/keymaps/t4corun/keymap.c
+++ b/keyboards/crkbd/keymaps/t4corun/keymap.c
@@ -1,3 +1,18 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include "t4corun.h"
 
 #define LAYOUT_crkbd_wrapper(...) LAYOUT_split_3x6_3(__VA_ARGS__)
diff --git a/keyboards/ploopyco/trackball_nano/keymaps/t4corun/config.h b/keyboards/ploopyco/trackball_nano/keymaps/t4corun/config.h
index 5ec3ee19..e6326191 100644
--- a/keyboards/ploopyco/trackball_nano/keymaps/t4corun/config.h
+++ b/keyboards/ploopyco/trackball_nano/keymaps/t4corun/config.h
@@ -1,3 +1,18 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #pragma once
 
 #define PLOOPY_HOST_LED_CONTROL
diff --git a/keyboards/ploopyco/trackball_nano/keymaps/t4corun/keymap.c b/keyboards/ploopyco/trackball_nano/keymaps/t4corun/keymap.c
index fa577318..d90b6d48 100644
--- a/keyboards/ploopyco/trackball_nano/keymaps/t4corun/keymap.c
+++ b/keyboards/ploopyco/trackball_nano/keymaps/t4corun/keymap.c
@@ -1,3 +1,50 @@
+/*
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include "t4corun.h"
 
-const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{ KC_NO }}};
\ No newline at end of file
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {{{ KC_NO }}};
+
+static bool num_lock_state = false;
+static bool scroll_lock_state = false;
+
+void keyboard_post_init_user(void) {
+
+    num_lock_state  = host_keyboard_led_state().num_lock;
+    scroll_lock_state  = host_keyboard_led_state().scroll_lock;
+
+}
+
+bool led_update_user(led_t led_state) {
+
+    // when scroll lock is pressed, toggle drag scroll state
+    if ( scroll_lock_state != led_state.scroll_lock ) {
+        toggle_drag_scroll();
+        scroll_lock_state = led_state.scroll_lock;
+    }
+
+    // when num lock is pressed, cycle dpi
+    if ( num_lock_state != led_state.num_lock ) {
+        cycle_dpi();
+        num_lock_state = led_state.num_lock;
+    }
+
+    // when all three are enabled, go to bootloader
+    if ( led_state.num_lock && led_state.caps_lock && led_state.scroll_lock ) {
+        reset_keyboard();
+    }
+
+    return true;
+}
\ No newline at end of file