Description of problem: Now Anaconda mount at /mnt/sysimage the first thing which will found. But it will be good if there will be parameter, which will act as suggestion, which partition should be mounted at /mnt/sysimage. Or there should be some menu selection or something...
What do you mean? On an upgrade, if there are multiple roots, we ask you which one you want to use. And if you're doing a kickstart upgrade, you can now specify which one as well or we fall back to the "first" to retain compatibility
When I was upgrading, anaconda didn't ask me which one to use. Anaconda simply use first one. But maybe it was some old anaconda. I can't test it now. It was in F8.