@paulmalenke pointed out (currently below) that scrolling still works because this only triggers if you start selecting in a horizontal direction. Given that,

@paulmalenke pointed out (currently below) that scrolling still works because this only triggers if you start selecting in a horizontal direction. Given that, I don't think it needs another mode at all. Alos, the tap to select behaviour should still work as it always has. You don't really lose anything.