A minor correction
OpenSuse (and Suse) have been using rpm packages since a long time. My first contact with Suse was with the 9.3 version (after Mandrake bought Conectiva), and it was already RPM based.
The "one click install" does exactly this. The problem you faced was, probably, because this is RC - and the repository isn't finished yet. On my system (OpenSuse 11.2) the MP3 part comes from the Packman repository.
But, alas, this isn't an oficial repository - so it takes some time to get all the packages compiled for the new version.
I'm testing 11.3 now, and so far it's great. I found a bug on the Xen - but that's RC for some reason. :D