[Dovecot] qmail + dovecot-lda

[ckubu]

hallo,

i am changing my mailsetups to qmail+vpopmail+dovecot.

is it possible to let dovecot's lda deliver mail into mailboxes but also 
deliver mails to forward-addresses in .qmail-files, if exists?

b.t.w. i know, its not an dovecot issue, but maybe anyone knows: i have setup 
defaultdelivery in qmail-control directory, but vadddomain ignors it. is 
there a way to make that entry the default for .qmail-default files?

thanks
christoph