[Trachmyr]

I was under the impression that you wanted a tactical engine that operated like a normal engine, but gave combat speed as well (i.e., each had 1 movement + 1 combat, so if you mount 6 you get 6 strategic and 9 tactical), that is why I though you couldn't do it. If you are going to just use 1 "afterburner" engine then it is do-able, but not terribly new (I've used them for a long time).

Here's one other idea that may let you make a difference between strategic/tactical engines... as you are not only talking about speed but also manuverabilty, you can add Defence to hit plus/minus to engines... since the ability now stack with others not of the same family. This can also be applied to sensors, giving certain types Offence to hit plus.

As far as the "Fast/slow" ship, I was refering to someone's idea of making the Tac-Engines a normal type of engine (presumably that you can only buy one of) that operated like a normal engine w/o move & bonus but with combat speed... for instance:

6 Quantum Engines: Speed 9/5 (1 move/3 bounus)
add afterburner (0 move/0 bounus/ 5 combat): speed becomes 6/8 (i.e., slow(er) strategic/ fast(er) tactical)

Personally, I would like to see combat speed stackable, just give all afterburners the "one per vechicle"... that way we can add bonuses to engines, vechicle hulls, etc.