I agree. The system is just way to big. I tried to cruise from the Molly to the Outcast base once. I had the time to go to McDonalds and back...
50% may be a litle too much though. I think that 33% would be better, since in places that have bases close to each other ( the trade center and the other base) it would look a lil out of scale.
EDIT: Gah , got ninja'ed. Anyways , I dont think that we should sacrifice functionality for realism. The whole game is already awfully scaled