Is there a A.I. mod for Rome 2 or Total War: Attila to make units fight more realistic.

I used to play shogun series and want to buy one of the 2 games. The one thing that bugged me was how on a unit of infantry only the first line would fight and the other back line would stand still. Or when cavalry charges they get bogged down even when flank a groups rear. Can someone recommend any mods to make the game feel more realistic.