I think the Neat mod by vazkii should be included in the client updater as a choice to replace the current standard mob health indicator. It's better looking, more functional, and isn't broken. And, y'know, it's pretty neat.
You mean instead of DamageIndicators? The Neat mod seems to show the health for every mob and not just the one you are looking at which can make it annoying if there are too many mobs or not?