As with Retropie / Retroarch, it would be great to have a global hotkey assignment to exit non-mame emulation.
Most either need ESC or CTRL-Q. (PCSX2, Daphne..ect.)

I am currently using antimicro for this.
This program allows me to assign a key and have it activate the assigned button after a ...

I would love to see this feature as well. My kids and I have monthly arcade game high score competitions and this would really assist seeing if your score was beat.