as said in the FF+ thread (but maybe its also interesting for base Fall Further):
I d like to suggest that instead of this "Commander" promotion requiring a lvl 8 unit, it would only be available to the Great Commanders you get to spawn. (maybe some exceptions like Donal Lugh etc. and )
But unlike now, Great Commanders would work a bit similar to adventurers in that they can upgrade to anything but the arcane path (and at a 50% upgrade cost discount). Obviously they shouldnt get adventurers free xp gain however.
This way has the following benefits:
+no more issues with certain spells/promotions/effects not working on commanders as they wouldnt have a different unit_combat anymore (hippus commanders can finally catch up with their armies due to getting horselord, commando and being able to upgrade into mounted units just for example)
+unique commanders for many civs (vampire commanders, mimic commanders, etc. etc. etc.)
+commanders would be able to get "training" xp from buildings in cities, at least up to 10 xp.
+YOU decide whether you want "Warlords" (commanders that are powerful fighters themselves but dont buff their followers that much) or "Tacticans" (commanders that focus exlusively on buffing their followers and dont buy promotions other than for this purpose )