No need for sarcasm, Angelmaker; I actually agree with you that DnD 4th is the fastest dnd combat, but I want to make it even faster (and maybe more appealing to players of other dnd editions too). In my experience, I find that most people compare low level 3.5th edition and 5th edition combat with high level 4th edition combat but never the opposite. Anyway, back on topic...
Let me clear up a little bit more how the rule is supposed to work:
- It is a free action.
- It affects a single target (Target: one creature). That means you lower the hp of yourself, you gain the attack bonus against only a single target or you gain the damage bonus against only a single target.
- You can drop below zero hp by using this ability (not 100% sure about this).
Indeed the defender gets more due to having more healing surges than the striker but if that is an issue then it is still an issue imho even without my houserule...