[Dovecot] How to achieve: Automove of mails

[Daniel Watts]

Dear All,

I was wondering if this is possible:

I am using namespaces to support my environment which has legacy mboxes 
and new maildirs.

In it looks like:

namespace private {
   separator = /
   inbox = yes
   prefix =
   location = maildir:/home/virtual/%d/home/%n/Maildir/
}
namespace private {
   separator = /
   prefix = mail2/
   inbox = yes
   hidden = yes
   location = 
mbox:/home/virtual/%d/home/var/spool/mail/%n:INBOX=/home/virtual/%d/var/spool/mail/%n
}


This basically means that there is a hidden inbox "mail2/INBOX" that the 
  user cannot see but which can referenced and accessed.

What I would like is for Dovecot to automatically move all mail 
(actually only as much as possible within quota limits) in "mail2/INBOX" 
  into "/INBOX" whenever INBOX is checked/expunged.

An alternative acceptable solution is to have something that moves mail 
once it has read. I would then symlink mail2/INBOX as a "New mail" 
folder. Once user's read their mail it is moved to the standard /INBOX 
folder.

Are either of the above possible natively or do I need to look at 
something like plugins? Incidently where is the documentation guiding 
plugin development? I've looked at the website but can't find anything 
either by browsing or searching.

Many thanks,
Daniel