Did you ever think why Power Surge, which is on a 120s CD? It is for a reason, you know.
and really? what reason is that? b/c it really offers nothing to the class in its current iteration. 120s is MUCH too long of a cooldown to be a reliable, effective ability.
mercs *NEED* situational interrupt resistance. what i proposed with Run and Gun does exactly that; and it would ONLY be available in the situation it was intended to be used for (against melee ranged combatants).
people can continue drinking the coolaid and asking for an "escape mechanism", but what does that really solve? it lets you run away from the fight faster, great. it does nothing to help Merc maintain effectiveness in combat.