How about this though.

1. Give polearm specs a better charge from the avg joe warrior. Give them a chance to stun an opponent for two or three rounds when they charge.

2. I picture polearm specs as being good for battling multiple opponents. Add to this by adding arc chop. Arc chop let's the polearm spec hit anyone fighting him with a weakened chop.

I think both of these would spice up polearm nicely and add some new strategies, but not make them overpowered.