I've got a very experienced party and one of them want to play a magus.
Since magus can cast and attack using a fu round, he want to cast using two handed his longsword. This way he can attack with str bonus x1.5, cast touch spell and attack again with free touch attack.(shocking grasp for example)
He told me that it is possible since adding and removing an hand is a free action (probably true).
It seems to me that it is an exploit of the rules.