I know there are currently limitations which is why most of the following tables haven't been tackled, but since this is a wish list...
NAGS (Williams 1960) (appears to be a challenge to recreate the rotating pop bumpers on the playfield and racing horses on the backglass)
Pinball Circus (Bally 1994) (JPSALAS/ Gargamel Park is an awesome alternative! My son loves that one!)
Little Pro (Bromley 1990) Not exactly a pinball machine and probably doesn't have a ton of replay value, but looks neat (rom not dumped)
Mini Viper Pinball (Sega 1996) Don't believe a rom was ever fully created, but would be cool just to have something to throw in the cab
Playboy 35th Anniversary (Data East 1989) Actually surprised this hasn't been done yet. Resources seem to be out there. Maybe it's just a really bad game?
Most of these are far-fetched...but I never thought I would see Michael Jordan either! The good folks here never cease to amaze me! By the way, is it just me, or is there no DOF configs for the MJ table?