Maybe this has already been discussed but such heroic attachments to units could possibly be done via the traits and followers system. For example, a priest might provide more casulaty healing after the fight perhaps? It's not ideal but it could be the best we get.
As for what happens in individual WH games I don't think it's relevant because it goes against the spirit of the game. It doesn't matter if the AI can handle it either, not when it shouldn't have to. Stuff like that is for the individual to 'cheat' in if they so desire, ie do it yourself by modding the mod. The basics should keep to the spirit of the game, both WH and TW.
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