I recently released a new update for my unity asset random prefab placer. I used my tool for a while now and found some points which could be improved. This update changes the removing brush behavior quite a bit. Now you have to select the special RPP brush first when you want to remove placed assets. Now only the selected brush objects will be removed, other objects, set with different RPP-brushes will not be affected any longer. I think this will be a major improvement to the first version.