I think the USS thing should be refined more, as right now it just serves as a random encounter, often times weighted to give you what your mission asks for. The missions stuff frankly should be more directed so you have an idea where to look, and maybe them use USS in those and only those places. But back to my point on refining...why can't we scan these USSs and get some idea of what to expect? We're getting a signal, can we not use our tech to see if it's a ship, distress signal, explosion remnants, container beacons? At least it would feel a bit more realistic, and give you some reason for steering over to them if you aren't on a mission that needs it.