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As for a sync button, we don't have one like you're looking for right now. That's something we're hoping to add over the next few releases (this summer it should be in there). The main thing is trying to give the user some control over what's imported so that if you, the admin, has many things mapped, clicking 'sync' doesn't override a lot of data the user may have entered manually.
I hope that helps answer your question, but if you need anything else, just let me know.
Thanks,
Alex