I would like to echo this. I've been using "keyboard key" + mousewheel up/down keybind combinations since the Outland Expansion of WoW. It was the only keybind process I could find that didn't aggravate the joints in my hands (genetic issue). Yes, I could use AutoHotKey to do this, but I worry that AHK would be considered botting software.

It's a real shame that it's not already available and it would make the game a lot more comfortable for me to play. This is the whole reason I've avoided playing some of the jobs because I know it may get kinda intense if I do. I've got my (aching) fingers crossed that it may be added one day.