Small suggestion, could there be a feature to hide HP during gameplay, and only show it during breaks? I know quite a few people who don't want the feeling of losing when they see their HP decreasing.
It's a part of gameplay, so it's not going to happen (plus things like hiding this/score/acc/etc. have been requested in the past).
If it really bothers you, just skin a blank scorebar-bg.png, scorebar-colour.png, and the three scorebar-ki elements and either make a new skin folder or do it to an existing one. See the Skinning FAQ if you need help.