Interesting, and it starts to help with my perennial issue with hyperspace travel: that it's become a nuisance minigame that you can't opt out of, but where most of the time doing 'well' just means you had less of a penalty from storms knocking you off-course, slipstreams crossing your path, etc. (Surfing storms is neat, I'll give that - but it's also ruinously expensive unless you've explicitly invested in solar shielding on every ship in your fleet. Which can be fun sometimes, but most of the time I want other hullmods for when I actually get where I'm going.)
Having 'scan hyperspace for bonus points' and 'go really fast for bonus points' should help some.
But the problem with slipstreams as currently implemented is that 95% of the time, if I'm in hyperspace, I have a specific goal in mind, and a time-limit because mission timers, bounty timers, etc. I can't really plan around shifting slipstreams because I'm going where I'm going regardless of where they are - so every once in a blue moon they help, and the rest of the time they're just in the way.
Now, if you had something like "mark up to five missions as priority missions and their timer doesn't count down while they're marked"? Then you could actually plan an expedition, do other stuff while waiting for slipstreams to line up, and actually take advantage of the system.
Edit: This also works when you still have access to Sebestyen's missions, since they don't time out. But you lose that when you gain gate access, and, sorry Sebestyen, but gate access is more valuable. Plus these days I mostly play games using Nex's 'skip story' option, so I don't get Sebestyen's missions in the first place.