[Dovecot] Valid config for lda_mailbox_autosubscribe with dovecot 1.2?

Hi,

Due to some reasons I've to support both dovecot 1.2 and dovecot 2.x, and I just found that the -s parameter I used to autosubscribe to sieve folders doesn't exist anymore in dovecot 2.x The problem arises because (AFAIK) in postfix's master.cf you can only specify one configuration, and I used to have this:

dovecot unix - n n - - pipe flags=DRhu user=vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${recipient} -s

Is there any way to make the config compatible for both versions, achieving the autosubscribe and not crashing dovecot?