It appears that when the BIOS isn't reporting the keyboard LED state back to the keyboard, the old code resulted in sending far too many key reports. (Specifically, out of controll key repeat on OSX)

src/Kaleidoscope-NumPad.cpp

@@ -28,7 +28,6 @@ void NumPad_::loopHook(bool postClear) {
   bool numState = !!(kaleidoscope::hid::getKeyboardLEDs() & LED_NUM_LOCK);
   if (!numState) {
     kaleidoscope::hid::pressKey(Key_KeypadNumLock);
-    kaleidoscope::hid::sendKeyboardReport();
   }
 
   LEDControl.set_mode(LEDControl.get_mode_index());