@Simon There is a ToggleMode setting but it doesn't appear to do anything, also I imagine it would affect all keys, not just key switches.

You can use an array to keep track of which key switches are active and use custom LAF to draw your keyboard, checking the array to see if those keys should be up or down.

..or just change the colour of your keyswitch depending upon state...

You can use an array to keep track of which key switches are active and use custom LAF to draw your keyboard, checking the array to see if those keys should be up or down.