EUREKA I've managed to do it at long last...........
I have created a new profile, altered the parameters, and bound it to my Walkera F210, may not sound like a big deal, but there is not a single video or instructions on exactly how to do this on an F210, I know I looked long and hard.
The YouTube video suggested by Hebrews12v2 got me part way, I had watched similar videos which did not help me as much, so many thanks to the author Danny Om ( I salute you ), but his video was not specific with regard to the Walkera F210 only about the Devo 7. Anyway long story short I found the "Clear" switch and the correct sequence to operate it and subsequently bind a new profile to the drone.
Then the second person to help was Mike Russell ( equal salutes to you ) his YouTube video "
" will show you how to copy a profile, save it and then change the
DREXP settings and map it to the D/R switch.
Thanks to the other OP's for thier suggestions, if enough people are interested in how to do this I will sit down and write a procedure.
Going to have a LARGE glass ( read bottle ) of wine to celebrate.
Waylander