[Exim] exim client pipelining

The last email I could find concerning this was from 2000.
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20000117/016293.html

Is it possible to configure exim to use pipelining when sending email to
other servers?

Would the effect be any different than a client side version of
'smtp_enforce_sync false'? Is it known that pipelining is improves
performance?
--
Marques Johansson
exim@???