Would it be possible to have a Nebula block scanner ranges when you scan into them as well as when you stand in them?
This would make a Nebula more interesting during warfare, especially for Space faring races that can use them to play hide and seek.
You could then also use that same mechanic to introduce more interesting ECM and cloaking technology so they don't have to be so analogue. Instead of either you see or not cloaking technology reduce enemy scanning ranges to detect ships and does not hide them from plain sight. Perhaps something for a DLC or expansion later on.