I think it would be useful and convenient if the driver summary screen had an "Expand All" button somewhere that expanded every subcategory.
Alternatively, you could probably just get rid of the subcategories altogether (or display the category under the driver name or something and get rid of the tree). Most of the categories only have 1 driver in them. The ones with multiple drivers are still only 2 or 3 and really aren't so confusing to require hiding behind a collapsible subcategory. The only exception might be the "System" subcategory.
Thanks!