Export from Pages Panel
The Pages panel — with pages selected — has a "print spreads/print pages" option in the contextual menu.
An option to export the selected spreads/pages to PDF would be useful, especially if it could be done seamlessly, without need for the Export Adobe PDF dialog.
Alternatively, the CMD-E shortcut with pages/spreads selected in the pages panel should bring up the Export Adobe PDF dialog with the selected page range already entered.
This would be especially useful when exporting contiguous pages!