I like the Druid werewolf idea, but would hate to see you totally change your vision for this mod. I'm just a guy that likes variety. I don't care how crappy a unit is (O.K. besides militia) I generally recruit everything when playing. It just looks cool in a battle.
I could definitely see animals easily getting in the mix, but you already have 'call animals' or some such spell in conjuration. Same thing with vine people. I guess I should brush up on some nature based fantasy for unit ideas. Besides elves, of course.