Perhaps we can start on the same page: Scrivener is super, super, super crummy. Unfortunately for me, I've imported a complete screenplay that was a Word document into Scrivener, and now I need to edit it into a industry standard screenplay. I'm going through the whole script systematically, but it would be considerably easier if I could select the scene headings, dialogue etc. with shortcut commands.
Select the text: Ctrl+Shift+F6 selects a sentence.
Then press Shift+Alt and either 1, 2, 3, 4, 5, 6 ... for scene headings, dialogue etc.