I don't see the need, but then again I don't know a gamepad.

How I would set it up, assuming you have like, 4 buttons on the pad, and like a bunch of triggers right?

Assuming you could trigger to change the attack all you need is, 3 buttons no mod for a base rotation, 3 buttons triggered for the 2nd set of attacks per stance.

Another 4 buttons with another trigger for your two common cooldowns and your oGCDs.

And another trigger with aoe abilities.