Here are my current Dropbox pet peeves:

- You can't share an arbitrary folder with someone, only a top-level one

- You can't share app folders

- App folders are buried in the Apps folder (duh). So, you can't use an arbitrary one with an app

Does this address any of these? I think all three issues could be really elegantly solved like this: do away with the concept of an app folder, and similarly with the top-level sharing restriction. Instead, give me an access control dialog for any folder. This would let me share with both apps and other users.