I've been using this for a little while now. If you've checked the "Prompt for test-release updates" box in the advanced settings preferences you'll get to enjo

I've been using this for a little while now. If you've checked the "Prompt for test-release updates" box in the advanced settings preferences you'll get to enjoy split panes. Press command-shift-d to open a new horizontal pane. It's really convenient and very well done.