Idea, a pair of mid-high level techs, that allow the creation and destruction of jump points in systems.
Mind you, these are balanced by being a huge module on a ship. And at the lower techs can take 50-100 years to destroy or create a jp, perhaps with the best level, you can pull it off in 10-20 years.
Dunno all the mechanics behind it. Perhaps make it such that when making a new jp, itll have a chance to open into a new system, or 1 thats already been generated.
This would be a tech for way later on, in the case of a game where you might literally run out of routes to travel. (I think you can sm change them now, but a legit tech to do it could be interesting.)