One more question.
In a case of dual display, is it possible to have the search and disk toolbars available separately for each of the displays?
You can add those elements to the main File Display Toolbar.
Or, if you want to give them more room, place them on a second toolbar which is added to the list of file display toolbars under Preferences / File Displays / Border.
Items on those toolbars always affect the side they are over, and you automatically get a second copy of them for the other side when it is open.
(You can also modify things on normal toolbars to always affect only the left or right side, but then they'll always be visible even when you only have one side open.)