Suggesting using the frequent contacts is a terrible idea. For many people, the FC is just full of junk. After all, unless you change the default settings (and many don't), every single person you ever e-mail is in there. Syncing the FC might in fact be much, MUCH worse than syncing the SAB. It's easy to get thousands of addresses in the FC even though the SAB may only have a small number of contacts.
Really the only workaround today is for users to create a new PAB and then drag contacts from the SAB to this newly created PAB. But again, that's only a workaround.
NOVELL NEEDS TO ALLOW MOBILITY TO SYNC THE SAB.