Also, WoW still recognizes it's SteelSeries mice, so you don't have to bind anything, all of the buttons work as they always had via healbot. Just select the button, select the spell or action and it worked perfectly. There was never a need to bind to action bar or anything.
You are definitely not the only person. I hope Strife reconsiders this as it will likely cause us minority to switch to another healing addon option. After 10+ years of using healbot and to have this feature ripped out over night feels bad. In the other thread that, was locked for some reason, Strife mentioned that it was partially to not confuse people, but there must be some middle ground to reach on this rather than just negatively affect those that still utilize multi-button mice.
With the latest update it seems that the number of buttons supported went from like 15 down to 5. Is there a workaround for us to get this functionality to work as it did prior to the update? I reverted back to previous install, but this is only a bandaid fix and hopefully there will be better way to utilize my mouse with healbot.