I'm for it, if it's easy to do. Effects should be kept small, though. More of a novelty than a thing that often decides combat outcome. How about this:
Swamp = half movement. Too big effect really, but how can we make it smaller? Maybe all MP beyond the first one are halved, so MP 2 becomes 1½ and MP 3 becomes 2.
Hill = +1 shield for all units?
Mountain = +2 shields for all units?
Forest = accuracy on all shots is reduced by 1.
These effects are not that exciting, can't think of much.
Swamp = half movement. Too big effect really, but how can we make it smaller? Maybe all MP beyond the first one are halved, so MP 2 becomes 1½ and MP 3 becomes 2.
Hill = +1 shield for all units?
Mountain = +2 shields for all units?
Forest = accuracy on all shots is reduced by 1.
These effects are not that exciting, can't think of much.