Thanks for that. I did look to see if it already existed but I couldn't find it. I went to Tools/Options/IDE Shortcuts and couldn't see Copy Lines Up/Down. But on further looking around, I find Tools/Options/Editor Options/Keystrokes with a more complete list of keystrokes that includes Copy Up/Down. Why are these options in two places?
I notice that the copy up/down functions work on entire lines. Is there any reason why these commands couldn't respect selections that included part lines, eg.:
This is a line with words, and more words
This is a line with words, and more words, and more words (after Shift+Alt+Down)
This is a line with words, and more words, and more words, and more words (after Shift+Alt+Down)