I have alot of imap boxes. Incomming mail gets sorted on the server and is
put in the correct mailbox. This means that I use no INBOX but alot of
other boxes. 
I have also defined a spamfilter, this filter is not auto activated by for
incomming mail. I always have to do it manually, wich is less then optimal. 
I have checked the apply filters to new mail in INBOX for this server, but
since I doesn't have any INBOX it is quite useless. 

Please make it possible to define the apply filter option per imap-folder
or just make it possible to filter all new incomming mail. 
A test case here is to make it work when mail is moved to a spamfolder on
the imapserver, there is a risk it gets filtered and moved to the spamfoler
on the imapserver and get filtered and moved to the spamfolder... ok you
get the picture ;-)