First thing I am going to say is buy a technical manual. It has everything you would every need to know up the street for calibrating the cutting height to what the dial says, to adjust the pedals and everything in between. There are pages of parameter settings and adjustments that need to be set electronically. Perhaps intimidating at first but I have yet to bleed, sweat or be burned adjusting parameters.
Jbhays has a good post in the "2017 2 Series (2038R???)" thread around page 58 on how to jumper the rear/mid pto selector. If this meets your needs he does a good job showing it and where you can get the plugs to jumper it and plug the switch so crap does not get in it. The only disadvantage to it I see is you lose the rpm readout for the mid pto since it always thinks it is using the rear. Probably not a big deal.
You can also go through the parameters as shown on the two photos and disable the RIO feature through the ICC parameters. It is easily reversible and requires nothing but pushing buttons.
ICC-014 from the factory is set at 01
For the first digit "0" 0 = No front PTO
1= Front PTO
Mine was set at zero which is confusing but perhaps this same control is used on tractors with a front pto, not a mid so that is why.
For the second digit "1" 0 = No RIO
1 = RIO PTH (do not know what PTH means but this is what it was set at. Seems it is RIO for Mid
2 = RIO PTR (do not know what it means but suspect it could be to enable RIO for rear)
Setting the value of ICC-014 to 00 will disable the RI0 from working when you back up.
I added a couple notes on the page because I always believe in writing parameter values down before changing them. There is also a step missing to get from the module you need to the parameters in it.
The nice thing is if you get lost at any point just shut off the key and it returns to normal. Once you get to changing the actual parameters you won't get lost.
Added 4/30. After changing any parameters always shut the key off to exit this mode.
It is raining out but in the shop it never failed to work. The rear pto still shuts it down if you leave the seat without setting the parking brake and pushing the PTO switch to the override position before standing. All seems to function as before except it does not shut down the mid pto when reversing. The other advantage of doing this is that since it knows it is using the mid pto you cannot exit the seat pushing the rio switch and have the deck keep running. It will still shut off if you leave the seat.
Of course I am in no way stating I would do either of the above options. It is always best to trust the government.
The pictures are not as clear here as on my screen. My apologies. I tried 3 cameras and different settings and these were as good as I could get If you click on the photos they are much better when they open.