I must say I like the new default, because it's consistent with the binding for creating rectangular selections with the keyboard (Alt+Shift+Up, Alt+Shift+Down, etc.). But I agree that we should revert to the long-time previous default, and if want to change it add an option.
@elextr I'm on it.
New behaviour is best for rectangular selections but you can't scroll page; old behaviour is best when you need to scroll the page...
I can't choose between old or new, is possible to keep both?