Hyperspace has no beneficial terrain. you have deep hyperspace which slows you down, and storms that slow you down a lot and hurt your CR. with long distance travel being common with just about any profession now, many players are having to deal with the now even more dangerous deep space and storms where they didn't have to as much before.
So, i propose a kind of Hyperspace current. they would naturally spawn and despawn over time, and move around hyperspace and deep hyperspace areas slowly like a snake.
Visualization:
These currents or rivers would bring the maximum burn of the fleet to 20, and reduce its fuel consumption, as if it were "riding" the current across deep hyperspace. Maximum acceleration would be reduced, and the fleet would be pulled slightly towards the center of the lane and carried in the direction of the current. It would be somewhat difficult to pull out of a current once in one, but not impossible regardless of the size of your fleet. in an emergency, you could also choose to use E-burn and pull right out without any resistance.
The goal is to create something the player would want to use, to assist in moving around through deep hyperspace and storm territory. being in one would completely ignore other terrain effects, but would drain your fleet's CR at a very slow rate instead, maybe 1% a day.
In the example, the longer current would be an old one, approaching the time where it will collapse entirely and dissapear. the shorter, green one represents a newer one, that is short and has only recently formed. you could take that current from Ex-Vis all the way to the black hole, but when you came out of the black hole the current might not be there. Think of these things lasting about a month, where they slowly begin to cover a large distance, and then at the end of their life cycle they shrink up to nothing within a couple days.
They could connect and cross over each-other, and do all sorts of weird strange things.
Something else interesting to think about, trying to cross a hyperspace river would be fairly dangerous as they might come very wide, and will try to drag you down its current. you can spend the fuel and or CR to force your way through with E-burn, or you could try to cross with just sustained burn and risk being blown somewhat off course. The currents could possibly vary in speed, length, width, or even lifetime. the faster ones might drain more CR than a slower one, and it would be easy to see which ones are more dangerous just by looking at how fast the current in the river is going.
That's just an idea ive had since i saw the hyperspace terrain blog post. thanks for reading!
Edit: i should add, that the effects are only at their greatest at the very center of the current. hanging around the edges wouldn't be anywhere near as fuel efficient / effective as being dead center.
TLDR- make glorious hyperspace rivers that you can ride!