[Dovecot] Namespace help

Dear All, I am currently using courier-imap which uses INBOX. namespace configuration now i am willing to use dovecot instead of courier-imap but without INBOX. namespace configuration means default namespace of dovecot which helps me to sort out no of mail client issues as well.

I know that i can change the default namespace configuation of dovecot to work with courier-imap namespace but not willing to do that so suggest me something which can help me doing the same.

Is it possible using postlogin script or something else ?

Thanks Regards

Piyush Joshi