We also use groupadd in the pre script for qemu package and qemu-tools - I assume that would be needed there as well?

Also, our workflow requires qemu-spec.in to be where the spec file gets modified, and then we run a script to generate the actual spec file. I'd be happy to make these changes, as I'd like to quickly do the final sync with 12SP3 and get that submitted for an update hopefully before FCS. I'd still credit you in the change log.