Allow Min & Max Zoom setting for Overlays
Locus map overlay engine is quite powerful already. It would be even better with one minor addition: Allow to specify the minimum and maximum zoom levels below and above which the overlay is NOT rendered, i.e. as if the opacity was set to 0%.
Reason: Some overlays and some maps don't make much sense together at very high (or very low) zooms (imagine a darker hill shade layer, or something that contains huge custom datasets with texts).
Another reason: You could use every single map (online or offline) as kind of auto-switching overview map. For example, select a mapsforge vector map as basemap, "OSM Mapnik Online" as overlay with 100% opacity, max overlay zoom to 12:. Instant overview map, no complicated Mobac creations with transparent layers, no troubles.
Work involved for menion: Two little IF commands and two GUI elements in the overlay configuration window.
User benefits: Huge improvements on Overlay usability in general.