This is purely an idea based on scenarios we play on, and would help with map size bloat in general.
Not sure how easy, but its just an random thought idea I had.
- option to set a Radar as "directional", cardinal E-W-N-S would be enough, so they reveal longer in that direction (ie if the default normal is 5x5, that's 25 chunks) so maybe a base 3x3 centered on the Radar, with an extra "cone" in the direction set with an extra 6x3 (so the overall rectangle with radar in would be 9x3)
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Pointed West