First: NO do NOT want to create a shortcut for this. Too many keyboard commands already. mac does not have a good way to show ‘what are all of the currently active keyboard commands while I’m in this application.
I often cut and paste from other programs where a blank line is used to indicate a new paragraph. Markdown and html both tend to work like this.
Paste into Scrivener, and then I have to go Edit → Text Tidy → Remove blank lines
I would like to be able to configure this as a button on the tool bar.