Livna can't rebuild for each development kernel, they would be rebuilding every day because it changes so often. Normally for development we only build for at the test X releases.
I've gotten into the habit of uploading the modules I build for my F7 testing install - If you want to take a look I've got the modules and the archived kernel RPMs
here or if you'd like I can show you how to rebuild the a package for your kernel from the SRPM.
Firewing1