IMAP functionality in BAT?

[Jay]

How does everyone use BAT for IMAP?  I don't see a Purge command....how do I delete from server?   thanks   (when you select IMAP4 account, those 'leave message on server' settings should become greyed out since they do not apply)   (i sent this from outlook express because I can't use and pay for BAT until I can get IMAP to work properly)