RPG plans, designs and ideas
Cure Light Wounds: Removes one wound from a character, plus up to 2-7 hit points of damage. Has no effect on characters who are not injured, even if they have suffered hit point loss.
It would require tracking wounds separately from general HP loss. GM's call as to whether the extra bookkeeping is worth it.
It seems to me that you're splitting hairs a little too finely, unless you're just that much of a prick DM ... lol.
How about, removes one "temporary status effect" (so it won't work on blind/deaf/etc)? Critical hits could inflict status effects instead of doing extra damage (or, player's choice)? Granted this needs a 3.5/Pathfinder-esque list of status effects (which is good and bad).