There shouldn't be any glitches on any games (except the shitty hacks). I never had an issue anyway. Could be dirty slots or something.
I've been eyeing up the Wellon VP-490 for a while now which apparently supports these gigbit roms. If I get one before you get round to it I'll give you a shout.
I was hoping to remove the shitty hacks from the menus and maybe inject some missing games adding more roms from a smaller cart. I think the menu program is going to be on the prog board among the game roms but it could be part of one of the CPLDs I guess. The graphics for the menu are in the S rom so there's a good chance.
I don't see why they don't just go for the big money and release a cart with every neo game and no hacks. People are crying out for it and there's room for the extra roms on there. Especially if series 2 is never coming.