mail.app and gmail as storage no doubles!

Hey guys,
So I accept the fact that since i have labels on gmail I have two copies of all my emails. On the tag folders and on the "all mail" folder(which includes my archived emails)
I was wondering if there is a way to have one folder/tag not sync with mail.app.
say i have 3 tags on the server
crew
work
family

is there anything i can do if i dont want the crew tag to sync with mail.app?

Also if i wanted to use gmail as storage, it is all backed up to my comp!
(yeah if i tell it not to download attachments its better) but not that much
help!
thanks in advance

 

IMAP