You know, I never thought of sticking a Tree on a carpet. What a great idea!
I wonder if that works for all immobiles?
Just my 2 cents, but my thought is that flying is too powerful as it is and should be restricted to a few units. Or, ideally, you should be able to fly between provinces you own, but not "paratroop" into an enemy province. Maybe only some special units should have the "paratroop" ability. I think I remember something like this being on the Dom III wishlist so maybe the flying rules will be changed a bit.
I think there is more strategy in maintaining lines of defense and only being able to breach those lines (via paradrops, amphibeous assaults, teleporting, etc.) with a limited set of special ability units. But hey, I'm a bit old school
