Ore Detector Rework
Make Ore Detectors active instead of passive. Instead of constantly scanning for ore while hogging PCU, they should be a block tool. Using them sends out a "ping" and marks nearby ore on your HUD for a few seconds. Probably a short recharge time as well, for sim speed realism.
This allows more options for ore detectors without risking performance. For example, we could have a long-range ore detector instead of having to spend ten minutes in flight time for each asteroid explored. Or a large conical ore detector that has the range to scan from the air, so that prospecting ships don't have to fly impractically low.