I upgraded from F15 to F16 beta using yum distro-sync. After doing so, the "Suspend when inactive for:" setting in the Power pain of the system settings app was enabled, even though my computer was certainly not configured to suspend on inactive before the upgrade, and I certainly did not want it to be configured that way.
Yup, we changed the meaning of a few keys. I've removed those lines from the migration script now. Thanks.