[Dovecot] Folder aliases

I don't if this has been discussed before - or already implemented - but it would be great if I could define one or more "aliases" for a folder.
A particular example might be "Sent" where different (badly-written) clients might have hard-coded "Sent" folder locations like "Sent", "Sent Items", "Sent Mail", "Mail Delivered", etc. - and I'd love to get those consolidated.

It would also be nice to show a different set of folders based on the client - or if that's not possible (if the client doesn't identify itself as part of the login sequence) then somehow via login name - maybe by an extension? So where my usual login might be "user@domain.com", and that would continue to be supported as the default login, I could now have "user@domain.com+thunderbird", "user@domain.com+mobile", etc.?

Daniel