I'll be honest, I think the Plasma Burn looks silly. I mean I'm not expecting realism here and it looks fun to use but it looks really odd to see a ship at that size accelerate that quickly and then lose all of the momentum like it hit something.
Fair enough. Maybe the one gif isn't conveying it fully. I tend to be pretty bothered by things that feel like they "break" the physics of the game, and this doesn't feel like it to me - it feels great to use. I also did tone the acceleration/deceleration curves down a bit, though.
(Btw: for me it recalls an "Enterprise coming out of warp" feeling, and I'm pretty sure I've seen similar looking stuff in other sci-fi, though I can't right now recall where.)
So now we have Burn Drive, Maneuvering Jets, Plasma Jets, and Plasma Burn? It feels almost unnecessary.
Also phase skimmer/teleporter, and to some extent phase cloak and temporal shell. There's a lot of mobility systems in the game, because mobility is important, fun, and there are so many ways to go about it.
Buuut, I'm not really sure what you mean, so maybe I'm missing an angle on this.