With warp drive, allow ships to move to a spot in empty space, and fight there. This allows to strategically place scouts as early warning, stage attacks on enemy worlds just outside their scan range, and intercept enemy fleets (on a string or not). Makes scouts even more valuable.

Already been suggested, moved to the archive and linked here: /#/endless-space/forum/28-game-design/thread/11790-intercept-fleets-on-lanes-in-space