I dive JJ-CCR and use the MK3 in CCR mode.
I have set an automatic setpoint change to 1.3 at 20 meter. This works fine, but it is not possible to manually change setpoint back to 0.7 as long as I'm below 20 meters (to reduce OTU). That works fine on my other dive computers (Shearwater Petrel 3 and Perdix AI). It should also be possible on the MK3.