Dolphin doesn't recognise the vibration feature of the Logitech F710 gamepad

[Diamondog]

Logitech F710 is a gamepad similar to the XBOX 360 controller that features X-imput and Direct-imput. Dolphin recognises the gamepad when it is set to X-imput. I can configure it and the gamepad also features vibration. However, when I try configuring rumble, Dolphin 4.0.2 (official) doesn't recognise any of the two motors the gamepad has (big and small motor). Is it possible to add vibration support for this (and probably other gamepads if Logitech F710 is not the only one with this problem, in case other users deal with the same issue) in the next versions of Dolphin?
Thank you