It will be nice if it can add a shortcut to
Or just add individual shortcut for step 2 and 3, then user can use third party program to create a Marco.
Except for 3., you can do this already - ctrl + āeā for toggling between edit and preview mode, and the settings let you define your own shortcuts for splitting vertically or horizontally!
You are right.
But I just realized that linking panels need to choose which panel to be linked, just adding a shortcut literally may not able to achieve it.