At the beginning of the game you can choose the type of movement in space and weapons. Which way the other engines and weapons will be obtained? At what stage of the game you may receive them? Is it possible to develop them yourself?
You can tech up weapons as you would in other have, via research. As for the ftl, it's not clear that you can tech them (I'd guess no) but you can use them in federation fleets and you might be able to reverse engineer then from debris.
As for engines I'm not sure if you can switch to a different kind, or the starting choice is permanent.
However I assume that you can improve them with research.