As I mention in my first response, one of the options with 4WS in the DX5 is RWS. I use one switch (C or D, I can't recall right now) that can toggle to any of the four options: first position is FWS, second is 4WS, third is Crab and the fourth is RWS (meaning rear wheels only-steer). So I could change the order (I think) and have RWS as the second position so I could flip back-and-forth between FWS and RWS. If I can't change the order then I would have to toggle through to the fourth position and then back to the first position do the same.
I don't know if this gets you where you want or not, but it's one option at leastI am familiar with this mixing option but it is not what I’m after. I am better off with the aux channel operating in the “all or nothing”for the rear steer. I need to be able to operate independently.
As I mention in my first response, one of the options with 4WS in the DX5 is RWS. I use one switch (C or D, I can't recall right now) that can toggle to any of the four options: first position is FWS, second is 4WS, third is Crab and the fourth is RWS (meaning rear wheels only-steer). So I could change the order (I think) and have RWS as the second position so I could flip back-and-forth between FWS and RWS. If I can't change the order then I would have to toggle through to the fourth position and then back to the first position do the same.
I don't know if this gets you where you want or not, but it's one option at least.
I am familiar with this mixing option but it is not what I’m after. I am better off with the aux channel operating in the “all or nothing” for the rear steer so I can operate them independently.