[Dovecot] lazy_expunge, 2 questions

[Hajo Locke]

Hello List,

do some tests with lazy_expunge
i have 2 short questions.
is it possible to set folder for expunged messages to read-only so no user 
is possible to really delete them?

i can use mdbox for expunged-folder. but would'nt it be more functional to 
use maildir to have possibility to delete separate mails?
when using mdbox the clean up by cron would effect always multiple messages 
with different ages?

Thanks,
Hajo