There was a very old idea (pre-1.0 design discussions) that undiscovered-to-you stars would only appear on the map as potential destinations after you'd done some sort of scanning process from a nearby system - perhaps selecting the star visually from the skybox and then some sort of sensor minigame - to pin down its location precisely enough to jump to it. This would have included "dark systems" without primary stars, to allow jumps in sparser areas to be made, and also to allow people to figure out personal shortcuts even in the bubble and potentially avoid bottleneck systems, or skip across a gap.
It never made it into any released version, of course, and with so much of the game now based around the idea that travelling a couple of hundred LYs doesn't take all that long, there's no way it can possibly come back later.