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I don't have DropStuff installed, but there might be a way, using Automator. If there is a DropStuff action for Automator you can download somwhere, then it's very easy, just use that to make a Finder plug-in (I think it was).

If there isn't a ready made action you can use you have to use the DropStuff command line tool and make a small shell script (or possibly an Apple Script) and run that from Automator...
 
Mitthrawnuruodo is correct that option along with the rename to compress and decompress is just with deluxe.
 
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