That's a bit extreme and not very effective, maybe some chance to "overdose" and knock yourself out or down.

Kidding, I think the penalties shouldn't be all so harsh anyway, even with reduced action point amount player can still spam them, a little bit slower, but he can, so that won't be a solution unfortunately.
Or maybe I'm not kidding, because if the "overdose" would drain one or two action points when knocking the player down, if the player has none he would be knocked out, that way stop spamming them. Dunno if it that is the right approach.