There are a lot of USS in many systems, often more than the bodies present. I would really like it if, like Asteroid Belts, that scanning one USS will resolve all signals in the system for that wavelength.
Yeah, the way I saw it that it does it in that 'wavelength', not necessarily all, but still it cuts down on it a lot. Something to cut down the scanning for USS I think is really what is needed (however best that is implemented) .
Maybe something like if you scan one Degraded USS then all of them in the system appear. If you scan a HGE then all the rest would appear. Dunno, maybe there is another better way.
Most of the time a system with a large number of USSs will be inhabited and have a nav beacon, and scanning that reveals all of them. I don't really do any USS scanning in empty systems so I can't really comment on the merits of your suggestion directly.