Please consider enabling alt+shift as an action that starts a vertical mouse select just as it does with the arrow keys to maintain this orthogonality.

Unfortunately this wouldn't really work, as almost all X11 window manager use Alt+LBM and Alt+Shift+LBM as a mean to move the window, so it basically won't work on Linux. As @elextr said, Ctrl+Shift+LBM is the shortcut here.

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