Can we reassign the dial of the DJI RC PRO? Or it's limited to the tilting the camera/electronic zoom?

I have upgraded from the mavic 2 pro to the mavic 3 and I am pretty happy so far, however the big downgrade is the controller.
The fact that I cannot control aperture or ev composentation quickly using a dial anymore is a big cons (e.g. using the app is just too slow).

I have checked the RC pro manual, it looks like the zoom dial is not customizable - is this true?

So far that is correct. Maybe future firmware will offer more functionality.