Now I understand. You mean in the exim.conf file.
Unfortunately there's more than just a section to use or not use, especially for ClamAV.
And lots of lines to be edited for your unblocking webpage.
Once you're going through the file to checking all the other stuff that has to be changed, why worry about a few relatively simply changes?
However I've already (a while back) discussed with DirectAdmin staff how to automate the next version of exim.conf if they decide to use it in Directadmin.
So let's get it out there first, and then move forward from there.
Jeff