[exim] scanning at ACL using external program

Hello everyone,

I haven't been around Exim for some time, so I want to ask here - are
there any new developments regarding scanning mail at DATA ACL using an
external program? Are there any plans to implement such feature?

Rationale: while Exim does have direct connection to SpamAssassin these
days, I am not entirely happy with headers generated (those added by
spamc are much nicer from my POV).

Regards,
Marcin Krol