couple of features that would be amazeballs!
Hotkeys for quickly pushing map assets up and down in layer order (groups too ideally)
Ability to “update/overwrite” a graphic image(s) by dragging in image(s) with same name.
Ability to invite others to collaborate on map making. Either live, or sharing maps with friends etc.
Just had a fun play around with the map making, you got vastly superior layer handling than Roll20! Great Job!