More than anything I think Haymaker should be reworked. It has an interesting interaction with Featherfoot, but realistically that could be redone too. Even though it would work similarly to Bloodletter and River of Blood, I think it being an off gcd, tp-free skill that is only able to be used after a crit would be a good way to go. The potency would need to be reduced for the sake of balance, and definitely it should not be a cross class option for Bard. However for Monk, Dragoon, and Warrior if it did work like that it would be a good filler to help max uptime.