Dropbox App incremental permissions

Is there a way to change an application's permissions per user?
For example, initially user can give only sign in permissions and later, if needed, give access to Dropbox files.
With Google Apps (e.g. Google Drive) and Windows Live (e.g. OneDrive), you can change the scopes whenever you wish like described here, or by simply adding more scopes during the OAuth2 call.

I see that there is a similar thread here and I wonder if anything has changed since then in API v2. 

Thank you.