It is a nice idea, but... The thing about being able to go anywhere can't work in the game. If you can get everywhere by just jumping, there is no point in trade routes, and pirates. You just go to A, jump, B, jump, C... While if it takes to long (for long distances) it will brake the gameplay, and the point of exploring . So, I think that this idea is a good one, if it is limited to as few systems away as possible. As for the wormhole... I don't know if you have seen Battlestar Gallactica, but that is what I have in mind by jumping. You are limited by time between jumps, fuel, and distance, and only one ship jumps. If you want to jump with the carrier, you have to be in the carrier. So, no wormhole, and this way smaller craft have to be in the larger. This is what I think would work, and still leave you the possibilities of pirates and trade routes.