It would be great if it would be possible to define a parameter and a necessary value for each server or each transfer group, that is evaluated before publishing, and will skip the publishing if the parameter does not have the value.
Say, I have a job which publishes data to servers A, B and C. I would configure parameter X as .*A.* for server A, .*\B.* for server B and .*C.* for server C.
If I set the parameter X to "A" the files will only be published to server A, if I set X to "ABC" the files will be published to all three servers.