My idea is to add a module that can decrease, to a certain degree the amount of time it takes to make a jump.  I think it should start a 4% and have it cost a bit for research and a moderate amount for construction, to reflect how in real life how much it costs to develop and make powerful super computers.  Plus, add a cap, lets say 25% time off calc max, and limit each ship too 2 modules so that they can't have 100% off time making for real instant travel, because that would be too extreme.

How about having a station being able to construct modules like factories.