Hmm… well I think this reply isn’t going to help either of you much I’m afraid but I’ve had no problems using my Intuos4 settings from the get-go with AR5. I’ve even re-maped things in AR5 to take better advantage of some of AR5’s features without any problems.
I’ve not tried setting the Erase button on the pen for colour picking but will give it a try later tonight and see what happens.
Please forgive this next bit, and I know it's kind of obvious, but are you sure that the key commands you have in AR5 for the actions you want to map are identical to what you have set in the tablet’s preferences?
Maker Of Replica Macoys
Techie Stuff:
ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.15.7 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M