Don't know why this hasn't been mentioned yet: when you spawn, you already have the advantage of full health. However, if you really want another advantage, perhaps players could spawn with 25 or 50 armour that would wind down to nothing after a few seconds, similar to how some games spawn players at increased health that slowly degenerates to normal levels.
I just realized this'd be shite for CTF.
I just realized this'd be shite for CTF.