(define-key cua--rectangle-keymap [remap beginning-of-buffer] 'cua-resize-rectangle-top)
(define-key cua--rectangle-keymap [remap scroll-down] 'cua-resize-rectangle-page-up)
(define-key cua--rectangle-keymap [remap scroll-up] 'cua-resize-rectangle-page-down)
+ (define-key cua--rectangle-keymap [remap scroll-down-command] 'cua-resize-rectangle-page-up)
+ (define-key cua--rectangle-keymap [remap scroll-up-command] 'cua-resize-rectangle-page-down)
(define-key cua--rectangle-keymap [remap delete-backward-char] 'cua-delete-char-rectangle)
(define-key cua--rectangle-keymap [remap backward-delete-char] 'cua-delete-char-rectangle)