I don't think that would work, as none of the subclasses have a set amount of health. If you took damage and stayed damage, than yes, that would be useful. But since shields recharge and their's no health lost it would be significantly underpowered. Having a healing ring would do nothing, as you can't charge forward because it wouldn't heal you instantly. It would only be useful undercover to regain shields faster, but that's pretty pointless. My suggestion would be to still have the support class idea, but when used it instead gave everyone a bottomless clip for the duration of the super. The super would deplete fairly quickly, because of how powerful this is, but it would prove invaluable in raids to get that extra damage, or in PvP to get that final push.