This is an interesting and inexpensive app I noticed on Product Hunt. I just tried it today and am pondering how to best configure it with my MX Master 3. But it does clearly work.
If you love a customized mouse with lots of buttons and want to extend its capabilities further it may be helpful.
I have not analyzed in detail yet which functions it offers can be done by Better Touch Tool and which cannot.
Not it cannot - As best I can tell its triggers are either keyboard buttons or standard left/right mouse buttons but not any of the other mouse buttons.
Abnormal Mouse should work for other mouse buttons. I am personally using a mouse that has 4 extra side buttons and it works just fine.
I guess the mx3 is sending some different events for the gesture button. But sadly I dont own an mx mouse. If you would like to help, would you mind checking what events it sends with apps like Key Codes · Many Tricks or Karabiner Event Viewers?
Does the activator setter in Abnormal Mouse display anything when you try to set it to the gesture button?