After most of the sarge release is actually done, I had the time to update my wishlist (though it's titled as "If I had too much time ..." :).

A feature that would really improve my mail configuration files would be if exim4 could handle hosts list in conditions, so I could write something like ${if $host{$sender}{+buildds}}{100MB}{2MB}. Well, time'll tell when upstream (or some nice gently soul) will provide that feature.