You seem to have edited your post to remove the qusetion about RepackMinimize, so hopefully this response is still relevant. This is from Sarel Fleishman (who developed these modules).
RepackMinimize is useful but quite complicated. For many purposes, I use PackRotamersMover in conjunction with MinMover, which together give you the same functionality but with more flexibility and transparency. If you’re interested in repacking and minimizing an interface I would do the following (resfile reading is one of the operations defined below):