Finally gave the Mouse + Keyboard setup on try on the PS4, seems great, except for one gigantic thing -

You can change your mouse look sensivity but you can't change your cursor speed at all.

The default speed is WAY TOO SLOW for any sort of challenging boss fight, especially as a healer. I'm not sure why they gave us hotbars to put all over our screen and a decent amount of mouse customization but no way to change the speed of our cursor?