Does the new special weapon rule also apply to 2 handed weapons. For instance does dwalin benefit from the hammer rule?, and if so dont you guys think thats waaay to op. He already has str 5 and if he could knock someone down by only throwing a 4 it would give him 6 attacks with 5 str and +1 to wound or am I missing here something?

If he chooses to bash he forfeits his attacks, so in this case it's not too great. I think the power of bash is for warriors, since heroes lose too much