Why have locked tabs at all if you can easily close them... Sure the scripting makes up for the lack of that but there's also the issue of re-using tabs that are already open instead of allowing new ones to be opened for the same path... Why have a locked tab for a certain directory if it is never referenced when you visit that directory to avoid spam?
The allow folder changes which rubberbands back to the locked path is interesting and one I haven't seen yet which could be useful but without re-using tabs it still doesn't matter.