TL;DRAdd the standard Windows cut/copy/paste keyboard shortcuts for all text-entry (not the in-game blueprint tool!)
What ?In Windows, left-handed people can use alternative keyboard shortcuts for cut/copy/paste operations.
These are: Shift+Delete (cut); Ctrl+Insert (copy); and Shift+Insert (paste).
These keys are on the right of the keyboard, which is easier to use while holding a mouse with your left-hand. Currently it's not possible to use these shortcuts in any of Factorio's text-boxes/areas (console/chat, search boxes, filenames, etc)
(Not to be confused with the cut/copy/paste tool in-game, which you CAN set the alternative keybinds for)