Yes - I`d love that feature as well... however, the email functionality in the community version is basic, and so one needs to live with that. The enhanced IMAP development appears to be related to the inbox - if you mark it as read in feng, it will be marked as read in the other imap server, if you delete, it will delete from the server, etc... it is a little more developed than it used to be, but still has some ways to go in the community version.
It would help to have the following:
Full sync with imap server, including sent items
Ability to access imap server folders
I realize that this is a difficult implementation as one has to choose how to handle email - put it in imap folders, or classify/relate it to a workspace.