Nick,
at the following GIT URL you'll find a branch heiko/x/cpanel/pre-flight
git://git.exim.org/~heiko/exim.git
Please be prepared that I'may change the history of this repo
without notice. This is no official repository, though it is
publicly available.
The branch heiko/x/cpanel/pre-flight contains a small patch providing
you a new main config option tls_pre_flight_checks (bool), which
defaults to yes, but you may set it to no to avoid the fork at
readconf-time.
I'm not sure if it helps a lot.
--
Heiko (already in Frankfurt)