Definitely a clever idea!that's actually a good idea...Another thing came to my mind.To make the experience more authentic, it would be cool to have a dipswitch on the cart.If all the switches are on off position, you get the menu and stuff.Otherwise, you can input a code to directly start a certain ROM (following the binary code would be cool, so that, on an 8 dipswitch, putting 00000001 starts the first one, 00001000 starts the 8th one, 00001010 the 10th and so on).
That's what some guys did with the 138 in 1 to get rid of the additional PCB:
http://www.neo-geo.com/forums/showt...-using-a-dipswitch-Game-list-with-binary-code
I think it is great to directly boot on a game, like an original game, and I guess it can keep compatiblity with Unibios too.