One idea occurred to me while I was thinking about how warping is handled by SEIV. So here you are:
I have always found permanent wormholes allowing the passage of any ship a bit strange. As you unfortunately cannot put ships on a cargo (and units cannot do everything either), I can only think of one way to restrict travelling from one system to anoter. What about allowing only one specific ship to open temporary wormholes? The component would be a basic Warp Opener with a size of 5,000kt (or so), and only a peculiar class of ship could use this component thanks to a mount reducing the size by 99%. (That is, 50kt)
As wormholes are permanent in SEIV (unless closed by a Warp Closer obviously), the solution would be to use a modified events file with only Warp Closed events, and a *very* high frequency for this event to happen. If everything works right, the wormhole should be closed a turn later. The settings should have to be No-Warp points of course.
The component would have to be limited, perhaps by requiring the component to be repaired at a space yard or making it expensive to maintain, or... This tweak would make travelling to long distances harder, and could allow for surprise attacks among other possible tactics.
Now the questions are, would it be possible to implement such a tweak? (I believe it can be done, but I have yet to test) And above all, would any of you find an interest to play this way? Or am I the only one?
Of course, I don't expect the AI to be really able to handle a game with this sort of settings, but who knows?