Bleeding... is powerful, when stacked. I, disagree with it, though I don't disagree with making it more powerful, just, in a less direct way.
Let it drain the life of rats upon a successful, damaging attack, without the loss of alignment that vampirism does? Give 1d4 hp upon getting a hit... you could totally lure rats into your fights for a mid-battle boost.
It'd still be a pathetic little thing, but it does gain a fair bit of utility.
Early game claw carry, anyone? ;o