Would be cool as well if they remained in their locations even if devices above are moved.
However, maybe that leads to the next question and possible problem? If devices can be locked, all it would take is one device 10 devices down to be locked in order for you not to be able to insert anything anywhere above it. Then you have to go figure out which one is locked so you can squeeze in another device. Does that make sense? Or am I thinking too much?