How can I pan using the keyboard? It's not possible for me to pan by holding down the middle mouse button with my mouse, nor is it convenient / easy for me to do. Instead, I'd like to be able to pan by holding down the left control key instead of the middle mouse button. However, I can't figure out how to remap this anywhere. I've been directed to the keyboard shortcuts menu, but this does not allow me to make a shortcut using just the control key, and it does not allow pan to only occur while the key is pressed. Any help would be greatly appreciated!