I have 61 in polearms just for lancing ( although you can even somewhat succesfully fight with polearms as inf. too). I say it's worth it .
It will cut the chance for repairs roughly in half, maybe more, for your lance. beyond that, not really useful.
The more wpf you have the less chance of an item breaking if it is a weapon (not sure this applies to arrow ammunition to be honest).
I'm pretty sure you can have WPF in any melee weapon (1handers, polearms or 2handers) and it will count towards them all in regards to repair %.
But throwing, crossbows and archery are seperate.
Only if one of the secondary modes also match, then it uses the highest of the modes wpf that you have.I don't know if anything has changed recently, but Paul has previously stated that '... melee weapons are one category for the extra breakchance thingy. The highest melee skill is picked in the script when checking for breakage.' (http://forum.c-rpg.net/index.php/topic,14164.msg199810.html#msg199810)
I don't know if anything has changed recently, but Paul has previously stated that '... melee weapons are one category for the extra breakchance thingy. The highest melee skill is picked in the script when checking for breakage.' (http://forum.c-rpg.net/index.php/topic,14164.msg199810.html#msg199810)