Dual 4-way games include
Puckman Pokemon and several other 2 player Pac-Man type games.
Wizard of Wor
Bloxeed and MANY, MANY other puzzle games.
Karate Champ
Assault
Dual Trackballs - Marble Madness, CABAL, Rampart, Atari Basketball, Football, Baseball, and Soccer. Ataxx. Dunk shot if it ever gets emulated. Tehkan World Cup
Dual Spinners - Blasteroids, dual 360-degree driving games. Arkanoid Returns, Off the Wall (BOTH games with this title are dual spinner). Eliminator, Warlords, there are more.
Single Spinner - Tron, Super Breakout, Avalanche, Tempest, Arkanoid, Every Sega vector game. Homo, Goindol, and a whole bunch of other Arkanoid clones. Wheel of Fortune, Pachinko Sexy Reaction, Two Tigers, Omega Race, Gee Bee, Bomb Bee, Circus, Cutie Q, Aztarac, and many more.
Tron needs a trigger-stick that you don't mention.