This is featured in Vikingr already - it affects axes both one handed and two handed, spears (no, you cannot kill a guy at point blank range with a long spear by wiggling around senselessly, only give him a bit of a stagger) maces and swords. Yes, even swords, in Vikingr most damage will be dealt with the middle section of the sword, with the area closest to the hilt dealing the least amount (although it being a blade, naturally it'll still cause damage). This cuts down a huge deal on the spammy spammy one handed left to right for instance, every single weapon has it's own sweet spot. Someone mentioned raising the skill cap - this absolutely does it. I was hugely in favour of this feature over there, so definitely I'll support it here.
By the way, you might say that it'll cause people to permanently stay at their own weapon specific sweet spot range and thus cause further backpedal and or annoyances, just so you know, it can actually give a reason to sweep for the FEET when one is CLOSER than ideal distance - it's all about the distance from your hand / hands to the target.
Anyway, one handed axe fights in Vikingr are possibly the most fun I've had with Warband in ages, land a proper blow and it's often a one hit kill. Awesome feature, requires a HUGE amount of stat balancing to even things out. Worth it.
Bjorn