I dont know exactly what Longbow has in store for Generals in Hegemony Rome but in Hegemony Gold I found in some cases the generals caused clutter on the unit card list in a town especially in Sandbox mode or Spartan Campaign. Perhaps a General Icon that shows a number of how many generals are there that can be expanded when clicked?

Yep the grey cards, Sparta for example in sandbox has over a dozen generals and it puts the the abroad brigades cards in the back which i use to help find units. I use generals usually once until the brigade is defeated unless its a exceptional general,a defeated brigade can be rushed back to the front lines gathering reinforcements along the way while a general cant and since majority wont offer big bonuses I find they better off staying at home gathering sheep vs micro managing all the generals.