My preferred way to play FPS games is using a gamepad to move and use abilities and using a mouse for aiming because using a keyboard puts too much strain on my hand. This is not possible in Destiny because the game is either in gamepad mode or mouse + keyboard mode, depending which input method was last used, with about a second of delay every time you switch. I get that this is a design decision because weapons behave differently depending on the input method. But letting us disable gamepad input in the game altogether would allow people to use software to rebind the gamepad to keyboard inputs and thus play with gamepad and mouse.