Maybe a popup information picture at every emulator, while press -i- (in mGalaxy UI), can be useful.
A selfmade picture (or an info.txt file), that display your personal input configuration ...
All my controls are very difficult (C64, MAME, SEGA, ...)
The -i- button is the same for encoder ipac32 (and mame basic config)
at switch 5 for player 1, so there can be the perfect one.
And sure, -i- on keyboard for i-nformation.