Coming back to this blogpost and skimming both it and the replies here gives me some thoughts;
* Tunnels in general are pretty fun, though I find actually staying consistently in the slipstream area is difficult when you want to ride it and all too easy when you don't. At least e-burn can usually punch through them if my route is taking me straight across a tunnel. Sometimes.
* If you've never tried riding a hyperspace tunnel as it takes shape, it's quite an experience. It's one thing to watch the things form, or to ride an established one - it's another entirely to be right on that cutting edge with no idea where you're going to wind up until it actually finishes forming. Be even cooler if you could somehow influence/direct the forming tunnel with your fleet's drives, perhaps...
* Hyperspace ghost signals in general are mostly cool. I think my favourite one is the one I've nicknamed "birds" - the formation that gathers together and then abruptly scatters when you get close. I also once saw a huge formation following a roiling hyperstorm as it meandered through the deep hyperspace 'clouds', which was fascinating. The ones that orbit you and pulse the drive drain are less cool, even if it's basically harmless. Then there was the time I saw a formation that, I swear, was the size of my entire screen and I play fullscreen at 1920x1080, fully zoomed out for hypertravel. I thought I was about to get mobbed by every single [REDACTED] ship in the sector at once.
* ...related note, but it might be useful/handy to have a one-time event that can fire at certain locations a short time after a first encounters with the various types of hyperspace ghosts. It took me wayyyyy too long to figure out that interdiction pulses scare off the drive-draining-mosquito-things. Could also be a good opportunity to inject some Lore about Old Spacer's Tales, or something you can talk to various figures about in bars or at Galatia or something.
* Would also be nice to have some hyperspace config options during galaxy gen or something, although if this hasn't been pitched a bazillion before I'll be terribly surprised (esp. since Adjusted Sector exists). In fact, just deeper galaxy gen customization at all really - more ways to freshen things up might help replayability a little. Maybe an "advanced setup" submenu with a bunch of fiddly bits you can tweak and nudge for density, hyperspace 'density', storm intensity/frequency, tunnel switch frequency, [REDACTED] intensity, all that stuff.