[dogscoff]

I don't think 100% is possible. I'm no expert though, so ignore me completely.

You might be able to implement your random warp points by modding a special invisible AI (ie cloaked ships & planets) with cheap stellar manip but no other tech available.

See Devnullmod's monsters for hints on how to do that. I know for a fact they are good at opening random warp points, but I'm not so sure about closing them.