ports FLAVORS on pkgsrc (and postfix)

[Daniel Bolgheroni <dbolgheroniml%yahoo.com.br@localhost>]

Hi,

are there any options on pkgsrc to what OpenBSD calls FLAVORS? If not,
are there any plans to include it?

I'm asking because of problems regarding Postfix support for SASL2. I
compiled postfix-current, which do not have SASL2 support by default. It
would be nice to have something like FLAVORS to do this job rather than
modifying Makefile manually.

Also, maybe this is not the correct list to this but... 

How to use the binaries of Postfix installed in /usr/pkg/sbin instead of
using the ones in /usr/sbin?

And, just to finish, why postfix AND sendmail are included in NetBSD by
default?

Thank you.