Well, party^^
The Idea is to have a distortion field around the ship that makes it harder to lock onto the ship.
It was partially inspired by Jump-Cloak in Eve online, though I played that for a total of 8 days a few years back.
Initially I thought of a cloak field, but thats either a completely new system, or already there and better used permanently.
Then I thought "That jump field could realistically be used to reduce incomming accuracy.
It's already possible today to widen space by means of electric currents, though unusably limited.
But thats already there, It's ECM. Sure, it's only for Beam weapons, against missiles it just reduces the range, but Beam weapons should be the prevalent weapon system on a Jump Point Defense ship.
So the idea to keep it simple was to have a "Jump-ECM" that has a value of half the current ecm level, and ADDs to the ecm of the ship, thus reducing the incomming accuracy and making the ship less vulnerable. It would only work during the Sensor Offtime.
I think it would be comparably easy to implement.
If you wanted it complex, you could go with a fixed Acc% reduction that also increases the sensor distortion time by an equal amount and with higher tech you could increase the bonus and the time, without increasing the penalty. --> Lot's of work for no result.