B5 style Jump Gates

[QuarianRex]

I've been trying to figure out how to do B5 style jump gates and I think that I have a good idea. The problem is that hinges on two key factors and I don't have access to my computer (and hence the game) for the summer.

This is what I want to know:

1. Is there any way to drastically increase the chance of a specific random event happening without effecting the other events? I looked through both the settings and events files and didn't see anything that would govern that (other than the base chances for high/medium/low settings). Specifically, how can I get the game game to continually shut down all warp points? Preferably without unleashing biblical ruin upon the rest of the galaxy.

2. Is there any way to limit the effects of the system gravitational field (preventing the closing of warp points in particular) to a single sector?

The idea here is to have a game where warp points are inherently unstable,closing after a turn or two and needing a jump gate to keep them open. Of course you would need to make warp tech a little more accessible and the AI might choke but it is an idea.

Speaking of AI's, does anyone know if they actually use warp openers? I've seen stellar manipulation ships being made but I don't know if they were being used.