A quick search of the MAME DB came up with these with 3-6 buttons:
Arm Champs II v1.7, armchmp2o, 3
Arm Champs II v2.6, armchmp2, 3
beatmania (ver JA-B), bm1stmix, 5 & 5
beatmania 2nd MIX (ver JA-A), bm2ndmxa, 5 & 5
beatmania 2nd MIX (ver JA-B), bm2ndmix, 5 & 5
beatmania 3rd MIX (ver JA-A), bm3rdmix, 5
beatmania 4th MIX (ver JA-A), bm4thmix, 5 & 5
beatmania 5th MIX (ver JA-A), bm5thmix, 5 & 5
beatmania 6th MIX (ver JA-A), bm6thmix, 5 & 5
beatmania 7th MIX (ver JA-B), bm7thmix, 5
beatmania Club MIX (ver JA-A), bmclubmx, 5
beatmania complete MIX (ver JA-B), bmcompmx, 5 & 5
beatmania complete MIX 2 (ver JA-A), bmcompm2, 5 & 5
beatmania CORE REMIX (ver JA-A), bmcorerm, 5 & 5
beatmania featuring Dreams Come True (ver JA-A), bmdct, 5 & 5
beatmania THE FINAL (ver JA-A), bmfinal, 5
Blasteroids (German, rev 2), blstroidg, 3 & 4
Blasteroids (rev 2), blstroid2, 3 & 4
Blasteroids (rev 3), blstroid3, 3 & 4
Blasteroids (rev 4), blstroid, 3 & 4
Blasteroids (with heads), blstroidh, 3 & 4
Boxing Bugs, boxingb, 2 & 3
Brick Zone (v4.0, Spinner), brickznv4, 3
Brick Zone (v5.0, Joystick), brickzn, 3
Cosmic Chasm (set 1), cchasm, 3 & 3
Cosmic Chasm (set 2), cchasm1, 3 & 3
Crater Raider, crater, 3 & 3
Dark Planet, darkplnt, 3 & 3
hiphopmania complete MIX (ver UA-B), hmcompmx, 5 & 5
hiphopmania complete MIX 2 (ver UA-A), hmcompm2, 5 & 5
Moon War (prototype on Frenzy hardware), moonwarp, 4
Moonwar, moonwar, 3 & 4
Moonwar (older), moonwara, 3 & 4
Off the Wall (Sente), otwalls
Quiz (Revision 2.11), quiz211, 6
Racing Beat (World), racingb, 4
Scud Hammer, scudhamm, 4
Solvalou (Japan), solvalou, 4
Sprint 4 (set 1), sprint4, 5
Sprint 4 (set 2), sprint4a, 5
Star Trek, startrek, 4 & 4
Starblade (Japan), starbladj, 4
Starblade (World), starblad, 4
Street Heat, strtheat, 3
Super Crowns Golf (Japan), suprgolf, 4
Two Tigers (Tron conversion), twotigerc, 3 & 2
Victor Banana, victorba, 4 & 4
Victory, victory, 4 & 4
Wink (set 1), wink, 3
Wink (set 2), winka, 3