I have heard people say there is no point in connecting switch controls as the games need analog,
Best way is to get psx to x-box converter and you can use your joystick for most games that ACTUALLY needs a joystick.
It goes like this...you can play tekken 4 on your ps2 with a non dual shock hacked gamepad and the game WILL start.but if you try to even start a game like silent hill 2 with digital gamepad and the game wont start and it will say "must have dual shock analog pad".
so similer things go for the box too.Certain games will start using converter+digital pad and won force you too use analog gamepad.
as for madcatz pad..its really simple to hack one of these..you can also leave the pad intact and solder in places inside the PCB(trace the contacts).
I also didnt really understand what you were asking Andy(not quite sure
but i am trying to help of course)