I've recently converted a bunch of a preexisting hosts to be managed by theforeman that I did not want to [re-]provision. This is a little scary in that newly created or clone hosts automatically go into the build state. One has to remember to immediately disable the build or disk runaway provisioning. It would be less stressful to have a method of adding both prexisting managed hosts that do not need to be provisioned and new [preexisting] unmanaged hosts.