Yes exactly, I need the 7, 9, 1 and 3 keys for diagonal movement; the diagonals flag is not up to the task.
This morning I created a virtual 8-way joystick widget and assigned all its movements to the numpad – and lo and behold it worked as intended!
Would be fab if you could implement 8-way support for BT controller joysticks, or allow them to be binded to virtual joystick widgets.