Have you considered working together with "Firelock" the maker of the mod "Gott, Ehre, Vatterland" (aka GEV)?

He has arduously worked all german tanks to be able to button/unbutton the tank commander, something that I don't think anyone else has done. Not only that, he made the small but important change of separating tank crews from tanks, enabling player to upgrade tanks without losing the experienced crews.

Other than that and small changes to tech tree and enemy A.I , GEV is very much vanilla. There's so many features in your mod and his mod that I'd love to see combined into one.