No seperate cells would be the greatest impact for me.
No more crazy loading screens or pausing of gameplay............my god, maybe one day..........
2nd is Spears.
3rd Destructible Environment: I would put second but it could lead to ravaged towns if I hit the wrong button.(oops was that my giant blazing inferno cioming from my hand?), Only would want Destructible if things could be reconstructed.
Climbing skill: I have a perfectly good jumping skill, tyvm.