I'm not sure how this may play out in a game such was planetside, or ps2, having no experience in those games, but in theory I think it may work well.
Since many hardcore fans are against regenerative health and regenerative health is enjoyed by many casuals how about a midway so when your health is at 2% your health would heal itself back to 25, or maybe 50 percent. That way you can't hide in a corner and come back like brand new, but your still injured enough for that damage to still affect you.
For example in the game blacklight retribution when your health is above a certain amount, your health does not regenerate and can only be recovered by heal injectors or supply depots in the same way I described so it works in other games.
I really how this post isn't as bad as I thought it was.
~Canadian