Seems fun I'll try that !
This allow me to ask a question which was bothering me : when using other arcade emulators than MAME like Nebula, Final Burn Alpha, etc etc, can we use the same roms as MAME (with or without CHD) or do we need to get them in another format ?
On the Model 2 Emulator you can yes. You just put the ZIP file in the ROMs folders. The only issue you may have is where separate BIOS files are needed, then you need to unzip the file and rezip with the BIOS files included, same as with MAME. I think I had one issue where it said some mpr- files were missing, so I had to fish around for them and ZIP them up with the game.
The Demul Sega Naomi Emulator is much more complicated on the hole. The only game I got working was Ikaruga, this is because the MAME version has a CHD file, so you just point at that. Otherwise it's more complicated and I haven't figured it out. I got Sega Strike Fighters to load pointing at a DAT file but for some reason it booted multiple screens and the game was all screwed up.
This BuildBot PS2 emulator works great, super simple to use. Played Raiden III and Tekken 5 so far, really quite good.http://buildbot.orphis.net/
Other than that I have Winuae Amiga emulator and Neo Rage 5.0x Neo Geo emulator. They work well but MAME kind of makes the Neo Rage emulator redundant because it plays all those games.
I'm waiting for a simpler GUI version of the Sega Model 3 emulator.