Google launched Advanced IMAP Controls which allows users to tune-up their Gmail IMAP experience. You can enable the controls on this Labs feature easily, just go to the Labels tab under Settings.
There’s a Show in IMAP checkbox next to each of your labels there, if you uncheck that box and the corresponding folder will disappear from IMAP.
You can also choose:
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Which labels to sync in IMAP
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Turn off trash messages
The IMAP allows users to mark messages for deletion, and that’s sort of a limbo state where a message is still present in the folder but waiting to be deleted. Whereas most IMAP systems do not follow Gmail’s concept of deleting from the folder right away.
