@ckp Hi again, retroarch supports I think 5 controllers, arcade sticks are above my pay grade, but I don't see why not, in the input setup you set them up individually controller 1, 2 etc. Retroarch does support ps1, although it always runs awfully for me so I use standalone for that. Correct ps2 gamecube and wii are not supported so I use separate emulators for those systems. I don't use Saturn a lot only have 2 roms, but yaubuse is there and works fine with my 2 roms.
Hope that helps, any more questions crack on and ill do my best.