On the question of superjumps, beyond anything else, I doubt they'll ever be introduced in a useful way, because the existence of a system that breaks the 30LY limit, especially by a significant amount, changes the setting assumptions far more than such minor additions as say, giving someone 100 Mckennas, or LAM's that have no drawbacks.
It's just too big a chance for the system to support without putting out a metric ton of supplemental materials.