Roleplaying/turtling is the best solution to me for enjoying a long, in game years, campaign. Constant battles, conquering lands gets boring eventually. I like, to a certain point, micromanagement too. The bad thing is that the game is called Total War and even if you don't expand fast cause you trying, like this mod, to bring a bit realism in this game engine you
will in the end going to face one of the Ptolemy or Seleucid monsters, an Epeirote/Macedonian empire stretching from Aegean to Baltic, a Celto-Iberian empire from Spain to Germany, perhaps a Carthage monster, Romani trying to greate the Holy Roman Empire invading Germany

or smth like this...
I'm trying to roleplay campaigns KH, Seleucid and most recently a Romani one, which is the most successful so far because i try to follow history so i kind restrain myself, i know what to do, when to expand and when not. Using force diplomacy some times helps to keep the beasts down.