Just click the sync button next to a verse to have the commentary go there, or use a commentary link next to the verse, etc.
There's no "auto" sync for scrolling since there is no way to move all verses to the top. It would just be confusing. Also, most people would find it hard to use the Bible panel to read the context of verses from commentary entries if just scrolling it would move the commentary away, etc. So SwordSearcher has a sync widget next to the verse, and commentary links in the margin for your favorite commentaries, etc.