move only the last cursor created in adjacent line

After you create a new cursor in an adjacent line (ctrl + shift + up/down on mac) I think it would be really great if you could move only that last cursor, because sometimes you'll want it to be in a slightly different position.
Say, if after creating that new cursor one would still hold the ctrl + shift keys but pressed left/right, only that last cursor would move.
(I know you can create another cursor in a custom location using the mouse, but I think it could be much faster if it could be done keyboard only).