I've been trying to figure out some way to make Jump Engines for quite some time.
Right now the B5 Mod does feature:
1) Jump Gates replacing WPs - at least the pics have changed
2) Jump Gate 'Ships' that can be built in a location and then loaded with the huge (and costly) jump gate component, which could then be used to open a gate to a new loaction - but the component is destroyed on use.
3) Jump Drive for ships - large component that will allow you to open and close jump points, this component is intended only for human v. human games and the AI won't use it. The idea is that all human players agree to close the jump point after passing through, and not to use it to close active gates - more of a roleplaying rule.
I would love to see some sort of time delay auto close or even a time lag when jumping between to points, but nothing like that is possible - as far as I can tell.
Another thing I was working on is a B5 Map with Hyperspace sectors that all gates will be connected to, to represent travel time through Hyperspace. Only wish I could limit new Jump Gates to open only to Hyperspace! (I do know that I can give a planet the ability to prevent new gates from being opened, but then a jump drive couldn't be used in that system to enter Hyperspace)
If you do come up with some creative way around this, please let me know!