I'm using a laptop keyboard for my controls and the only buttons that are responding are A,S,Z and X which I figure are replacing the 4 main buttons on the original SNES controller but I can't seem to find a way to use one of my keys as a "Start" replacement on any of the config menus
You go to config -> input, click he "#1" tab, then click the box next to start, what happens? At this point it should prompt you to press a key.
So, what's stopping you here? Does it lock up? Does it spit out an error? Does it act like you're holding some other key? Be more specific about your problem.
Maybe these people were born without that part of their brain that lets you try different things to see if they work better. --Retsupurae