It would be nice if Mame started doing things like adding rom sets as the developers intended the game to be. Plus also say for example a game slows down because there's too much things going on in the game play there could be a rom version of the game where it runs smoothly. I think though in both these cases there could be a cheat file that could do these things & you could actually set the cheat file to automatically do this without having to keep activating the cheat, that would be a nice add on to Mame exactly like the cfg file does with setting how many lives you have & how hard the game is etc. I do think that this would be a great idea. I think it's basically like what you would do when you put the game in service mode on games like Metal Slug & Mortal Kombat to activate the blood & violence so once that is set every time then you start up the gsme there's no need to do it again so the same thing could be applied to cheats & the censoring plus adding configurations to making games run smoother.
We all have ideas that you would like to see added to Mame it's just another 1 to add to my list.