Really like the categories that you can set, but working with them is a little iffy. Especially if you want to move a larger number of files into a category, you have to do that one by one. A bulk merge would be a great feature here.
It also would be great to define categories and maybe have filters for those, e.g. files which match a certain pattern or extension should be moved automatically to a category. This could also enhance the Directory monitor. I can see the idea of the auto category creation with the directory monitor, it would even be better if I could do the categories as mentioned above with patterns.