Idea for a new Passive ability that would help in pvp

[Trevor_the_Bruce]

I have been thinking about how to help the Merc/Commando survive well enough to survive being focused like they do. What if Adrenaline rush/Kolto Overload healed twice as much as it currently does at just as rapid a rate as it does right now with a 4 second longer duration plus Commandos and Mercs can get passive ability that combines the effects of the lvl 52 ability called Adrenaline Fueled from the Vanguard plasmatech discipline + the heroic utility Emergency Stims. Maybe the damage reduction boost from Adrenaline Fueled can even be doubled to 60% reduction from all damage while Adrenaline Rush is active. That'd make Commando's and Merc pretty hard to take down I'd think. Do you guys think that might be a bit to overpowered for the commandos? I really like their dps numbers so it might be a problem if they can get 12 seconds of really good survivability, but maybe that is what they need to have to be good in ranked.