- Never take weapon skills. Skills are multiplicative, weapon skills are not. i.e. A point in Warfare grants you a bigger damage boost than 2Hander.
This point is irrelevant to a mage-party since Warfare does literally nothing to boost the damage of wands and staves. Two-Handed DOES boost staves, although you are correct that it does not do enough to be a great investment.
I keep Warfare gear on my battlemage for access to Whirlwind which does the most Magic Armour damage in a 360 degree radious as it takes into account int bonus AND weapon damage - since we are talking staves here,if the element of the staff matches that of your main magic school,then to determine weapon damage we take into account bonuses from int,main school of magic and 2 handed. (I don't use two handed on my battlemage though,but I did test it to see how high the damage goes)