Night combat: Haven has a day and night cycle it's time we use it.
All ranged combat should be halved in night time. So if you have a Marksmanship of 100 in night time you would have a 50. If you can not see something it gets harder to hit or target. Now to counter this I think we need to add new skills for combat. The skill tree certainly needs fluffing. So a possible skill would be night hunting. This would give you 25% back on your penalty. So in other words your 100 markmanship would be 75 at night instead of 50. It reflects time spent training to fight at night or in darkness.
As with ranged combat melee is just as affected but not with hit penalties. If someone is up close you can hit them. However if someone flees beyond a certain vision range agro should be broken instantly. Chasing someone through the woods at night with no modern light sources or detection gear is neigh impossible.
We now have a reason to carry torches and form search parties with such. This will work even with night vision clients offer as the game breaks the agro even if yoru night vision allows you to see them.
Movement: We have penalties for movement in swamps, water, for running... However terrain needs to impact with what you are wearing. Im not big on carry capacity restrictions but if you are decked out in heavy metal armor and trying to run on a mountain and such your going to tire quickly. Terrain should impact our movement based on our restrictions. Boats already slow us so should armor. With horses added now it should apply to them as well. There is a reason why you never hear of cavalry charges in swamps.

Vision: I imagine this one will be the most objected to but Im putting it out here anyway. If you wear a heavy helmet you should have agro limitations. ie. maybe a 90 degree range. No more instantly targeting someone behind you because lets be honest you can not see them there as your character. You the player may but they won't and that matters.
If we are going to do a fair and balanced system then we need those impairments. Why you may ask? Simply put we may be heroic or infamous but we are not super-Human. Darkness limits you. Armor protects but limits you. Vision limits your opportunities. Im not saying we can't add skill to learn to work with them but your base ability should be limited by many factors.
Thoughts?