I find myself using PreView pane very often. The way I see this happen is anytime the mouse pointer is over pre-view pane, the pointer would be center of one inch "magnifying glass" of document. This would allow me to quickly check document revision detailed on first page.
One looks ike a Monitor icon, and the other looks something like a palette. Making the help file more complete. One addition would be a description of all of the items that make up a window, or pane. This would include descriptions of all of the buttons and user-interface selections. It would also have complete descriptions of all of the features. Custom synchronization is one feature that is crying out for explanation of what options are available and what each does.
SORTING BY MULTIPLE CONDITIONS. For implementation I have a little suggestion. Click 'Date Modified' tab followed by 'Type' tab to arrange according to type (primary) and date (secondary). The last tab clicked becomes the primary condition,