As of now the base casting rotation for RDM is 5 buttons, 5 buttons which doesn't particular fit well with a controller.
Therefore i've personally set up a macro that swaps out the light skills with dark skills and vice versa by using hotbar swapping, however this unfortunately also doesn't flow that well due to macros lack of queue/feedback that normal skills have.
Therefore it would have been lovely if RDM could get an optional action that let you condense Verthunder/Veraero and Verfire/Verstone into two buttons with a 3rd button "transpose" swapping between light and dark of those.
This way the caster rotation would be neatly fit into 4 buttons rather than 5 and thus fit perfectly for gamepads/controllers without affecting the rdm's rotation in any notable way