[SUGGESTION] Clicking in the left side options tree should change active placement layer.

[divinebeam]

Self explanatory, if you click terrain it should switch to terrain mode, if you click units should switch to units, if you click sprites it should switch to sprites. It works if you click an actual item within the title but maybe it should also switch if you simply click the title. This might be just because I'm used to scmdraft but maybe its also a good QOL thing.