Assign generic parameter to Ch 7 or 8

Is there a way to assign a Generic parameter that is not on the Ch 6 7 and 8 list?
I would love to assign CIRCLE_RADIUS and CIRCLE_RATE

Having the control of some of the flight mode parameter would be great.

I answer myself… I found Circle_Rate on Ch6. I am looking for a way to use easily the Circle mode for filming but it’s no so easy. Any suggestion?