[Dovecot] configuration

I've noticed that there are some parameters mentioned in the docs that aren't identified therein (ie: login_process_per_use).

Is there a more generic set of docs that can identify what each of the parameters and what they do, or at least something that will allow me a simple how to to avoid embarrasing situations.

I supposed I should only settle for ssl based connections (imaps/pops) but I will be open to digest-md5 if I could.

I'm also curious to see how I can use pgsql authentication with dovecot. I think this would be great to work with since I'm basing all my postfix settings around postgresql as well. But for now I'm not sure how to use postfix authentication with the file directories I'll need to use for the maildirs (and procmail!).