When a user wants to install rpmfusion, they need to download two files: free and nonfree.
What if you add a package called rpmfusion-free-and-nonfree-release which will contain both.
Then, after install, it will be updated to an empty metapackage that will have a Require to both rpmfusion-free-release and rpmfusion-nonfree-release
This reduces the number of steps a user has to take to install rpmfusion significantly, making the user experience much better.