I guess I've never understood how this is helpful. In order to use it, you'd first need to configure the repo, which means creating/editing a config file. And you go to that effort so that yum can resolve a handful of inter-subpackage deps for you?
A large handful (build a gcc sometime), that you have to pick and download. And yum should have --repofrompath like repoquery does (I thought it did, actually). i.e.:
yum upgrade --repofrompath=test,http://koji.fedoraproject.org/scratch/roland/task_1965799
I've just never had any trouble running yum localinstall against the resulting rpms.
Nor have I, after either spending some time operating my mouse to download the right ones, and trying three different times to have it tell me I missed one I forgot was actually a dependency of the one I needed to test, or else spending the same 10 minutes again every time (I know, I should just write it down) to figure out how to make wget or curl download the whole directory full without filling my world with files called 'index.html?M=D.2' or following too many links and trying to download the entire koji site.
Thanks, Roland