I made something similar, but much simpler, and never posted it for general use...
The one cool feature I added in was that it would blink the "num lock" "scroll lock" and "caps lock" lights on my keyboard to indicate who's turns were submitted, and when the turn processing was done
Would you be able to make use of an addon program to blink the keyboard lights?
I could write one that periodically checks the default directory for certain files, and turns the lights on or off in response.
You program would just have to run mine, amd then create a file (no content required) called "CapsOn.flg", say, and which would turn the caps light on.
There would be at a minimum,
"xyz_On"
"xyz_Off"
"xyz_Blink"
"program_quit"
I could also easily add some pattern blinking, such as sweeping left to right.