I think they should also tweak 1upt, but not to the full effect that cIV had. I think that you should be able to have up to TWO different military units on one tile; one melee and one ranged.
2upt wouldnt solve any problem, or better the combat game, that the whole concept of 1upt was designed to do in this Civ version.
Which means, if you dont like 1upt, you might as well ask for no tile restrictions on units. Because any middle ground would be restrictive, without any of the benefits of 1upt.
2upt, 3upt, 4upt...all worthless. It only makes sense to restrict tiles to one military unit, or no restriction!
despite the pain in moving units, i personally prefer 1upt. Combat is more interesting in having to figure out terrain vs unit placement and ranges placement vs melee placement. Im glad the game doesnt allow me to stack!