Hmm I tried the auto_win thingy. It's the best way but it feels like cheating.
So yeah, the Ptolemies use 95% phalanx, so it's virtually impossible to autoresolve battles. And I'm too bored by playing all the battles by myself. Though the auto_win command makes only sense when I outnumber the enemy by a large scale by troups and stars. Otherwise I'm not gonna gonna use it.