When you grab a query and go to drop it in a category folder - unlike in windows drag and drop - the recipient folder does not highlight. It makes it difficult to be sure you are dropping it in the proper folder.
Please change it so the behavior is similar to other drag and drop features we are used to in computing and the recipient folder highlights when you hover over it.
I'd also like to be able to drag more than one at a time, but that is another story I guess...