[Dovecot] How to bring dovecot to using a slightly modified passwd file

Hello all,

I am trying to use a setup where domains have separate passwd files with a slightly different layout. Is there a way to tell dovecot that a passwd file contains everything it looks for but on different positions inside the passwd file line?

Standard passwd:

USERNAME:PASSWD:UID:GID:HOME:extras

different layout:

USERNAME:PASSWD:extras:UID:GID:HOME

Or do I have to patch the source, and where if necessary?

Thanks for your help.

Regards, Stephan