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Deleting a directory that contains a very large number of files causes the IDE to be sluggish and does not provides very little indication that it's in-progress. The mouse turns to an arrow+hourglass, but no other indications. It appears the directory was not deleted. If I attempt to exit the IDE, it will alert me the Delete Action is still in progress. The biggest problem with this is the performance hit to the IDE while it's trying to delete the files. The directory contains 10K+ (sometimes 40K+) output files in several hundred directories. The easy work-around is to go to the explorer and delete the files. The IDE should provide some kind of feedback mechanism (Warning: you have a lot of files--this will take a long time to complete" or put a progress-indicator on the status bar like other long running tasks).
The IDE does shows some signs of background activity and does prevent the corruption of user data (by not allowing the user to exit via close button). I don't believe there is need for anything else, but I am ready to accept a patch.