I don't think this is a thing in MgT2e, but in other editions the prototype jump drives didn't have Jump Regulators. So a J2 drive didn't jump 1 OR 2. They Jumped 2. Not 0. Not 1. Just 2. Every time.
So that could be a fun thing to put on a TL 10 J2 as a disadvantage
So that could be a fun thing to put on a TL 10 J2 as a disadvantage