Could give you free race points, or special boarding/engine/weapon destroying weapons...
How about variable ship speeds like in Stars? In Stars if you had a warp-9 ship, it didn't have to always travel at warp 9 - it could travel slower with the advantage of reduced fuel usage. If adding a speed slider or emergency/slow move toggle is too much micromanagement, the supply usage can always be automatically reduced when the ship is fleeted with slower ships
