It's a terrible addiction!!!
The 4-way joystick is configured for pac-man, dig-dug, etc with a 4-way restrictor. The 3 red buttons are in parallel with player 1 (1,2,3 buttons) - ideal for missile command, centipede, donkey kong, etc. The spinner is to the right for Tempest, Arknoid, driving games, etc.
The top illuminated buttons are player 1/player 2 credit/start and MAME controls yellow=pause, green=enter, blue=tab, and red=esc
Side buttons are for pinball - left/right flippers and left/right magna-save
The coin-door is illuminated and works too - takes tokens
I also setup a power relay that senses the 12vdc from the PC to switch on/off the audio amp, monitor, led lights, and fans. The switch is a momentary switch that ties to the PC power up pins on the mother board.
Below are my Thingiverse designs - feel free to download
U-Trak Arcade Trackball LED Illumination
https://www.thingiverse.com/thing:4369759
Zippyy Classic Joystick 4 Way Restrictor Plate
https://www.thingiverse.com/thing:3898688
Arcade Power Button Sleeve Adapter
https://www.thingiverse.com/thing:4001913