Allow players to kick while in the air. A swift kick to the head should knock your target to the ground. A risky move with big payoff. Probably would afford many hilarious moments in game as well.
Add shield bash. A quick, short range move that uses your shield to stagger the target, perhaps causing a small amount of damage (similar to kick, but would not break your block). This could also cause damage to the shield to prevent shield bash from becoming over used. I know this has already been discussed on the forums, but I thought I would 2nd the opinion.