Remember the "Spin Cycle" game at PBW? Well what about this - I call it "Eye of the Storm"!
Custom map with several rings of systems surrounding a central system. (Which contains a ringworld, of course!) The closer you get to the center, though, the more random ship movement you have. Also, as in Spin Cycle, the warp points going around the circumference of are one-way (alternating clockwise and counterclockwise as you progress inward), while the radial warp points are two-way.
Hmm, I wonder what if we left SM tech on... if there is a one-way warp from A to B, and you're sitting in B, what happens if you try to create a warp to A???
Do all ships trying to warp from A to B now come out at your new warp point? Or are you just not allowed to create it?