Considering heavy thrust is basically like those GCD DOTs that got removed (but even less interesting as there's no multi-target interaction with it), I'm surprised it didn't get rolled intro Impulse Drive (which currently is just 'another' True Thrust, but for a different combo line - no real reason to exist really) and then be done with it.
It has no mechanics with stacking or anything like that, and just has the on/off state. The actual buff itself could easily be rolled into the potencies of all skills and abilities too. It's the poster child of being a 'bloat' ability which didn't get removed in the 'remove bloat' update.
