by the way why not use a small exe with one of the existing fe's that is launched just before a game to rotate the display according to the orientation of the game...would save you a lot of work.
I though about that - would be easy as my interfacing only needs one bit set to switch either to horizontal or vertical.
But 2nd on my wishlist is that the FE shows only games suitable for the current panel. Of course, I'd need an option to show all games available (so you can see what you can get with an other panel), so maybe for this I just could define different categories.
Don't know if any FE out there supports on the fly orientation-changing, but this wouldn't be the hardest thing, I guess.
Is your "old" FE-version (with shooting the galaxians, the one with the 3D-cabinets is very cool but to modern for my cab I think) able to do this?

I didn't wanted to type the list myself in, I meant that I'd build it up internally in the program itself. Though with controls I wouldn't rely on that, e.g. it says that all NeoGeo-games need 4 buttons just because they are there. Here some handwork is needed to make it perfect.