Make it possible to tell drones to only pick up resources/materials from the ground. After a few days of having conveyer belts its inevitable that you occasionally have to drop stuff on the ground and after a while it can get very crowded, having an option that tells drones to 'clean up' would be nice,
#Cleaning Mode
toxic herald
woven pewter
Storages don't allow drones to add these resources to them by default. if you enable this ability they tend to do a pretty good job of cleaning up. IMO addition to storages should always be enabled by default.