I have always considered that horse units should be penalized in melee in the woods. I know that some units get combat bonuses in woods/snow in vanilla RTW, but is it possible to penalize a unit for melee in certain terrain vs. certain units? Or is that hardcoded?
Cavalry could get more of a shock bonus in open terrain as a sweetener, of course; but they really should be put at a severe disadvantage vs. infantry in the woods.
Any thoughts?