In my last round i found the Double Shot Boon, which was kinda great. 2 Shots for the Price of 1? Neat.
Sadly, this Boon completely ruins the Engineers Gatling. While other Weapons still consume only 1 Round, the Gatling consumes twice as much Energy, which makes it pretty much impossible to use.
For it being such a rare Boon and working fine on any other Ranged Weapon, it should work the same on the Gatling and only consume the normal amount of Energy.