So LEDWiz has an atomicfe plugin, that's good for me 'cuz mala's giving me headaches. And I'll be able to configure it to turn on at the start of a game (no keypressings) and off at the end? Is it a real chore or fairly straightforward?
Yes - LEDBlinky will turn on the buttons used for each game and then off when you quit the game, but this only works for MAME. For other emulators, you'll need to manually configure which buttons should light up.
As for how straightforward it is to configure LEDBlinky - you'll probably get a different answer from each user

. Basically you need to do two things - First define how your LED's are wired to the LED controller (which ports) and what Keycode is assigned to each (this is your DevicePortInput map). Second you'll use the config app to choose which options you want to use (game start, speech, animations, etc.). I tried to provide extensive documentation and you can always ask questions on this forum.