Comment 6 for bug 122529

not to forget the Trash folder as well. See:

http://lifehacker.com/software/geek-to-live/turn-thunderbird-into-the-ultimate-gmail-imap-client-314574.php

However, in my opinion the amateur end-users won't know what SMTP servers are, much less set them to something else. So since the wizard is meant to be as user-friendly as possible, maybe the default Gmail settings should still be set.

And there should be a list of notes somewhere on Google which says what IMAP features Gmail doesn't support.

Found it:
http://mail.google.com/support/bin/answer.py?answer=78761&topic=12762