3.1 is supposed to have joystick support - how in depth that is and how much is exposed to the binding interface is as yet undetermined. I've tried binding keys to my X-Keys and G-Keys without management software on the PTR and this failed, having no true game controller to test with though limits my ability to test. I believe Lax tested this with an x-box controller to find it unsupported as well. (Personally the idea of having joystick buttons available makes me giddy, as would have a new set of buttons I could bind!