Logitech Mouse Support
Starting with BetterTouchTool version 5.777, BetterTouchTool natively supports Logitech Mice (by implementing parts of Logitech's HID++ 2.0 protocol - https://github.com/Logitech/cpg-docs/tree/master/hidpp20)
Note This is supposed to be a full alternative/replacement to the Logitech apps like Logitech Options+ or G-Hub. Actually BTT won't work correctly while any of these are installed.
Setup
Go to the "Normal Mouse" section in BetterTouchTool and add a "Logitech Mouse Configuration" item there:
Then select the correct mouse and experiment with the best settings for your use case.
If you want to remap the mouse buttons make sure to check the "Make All Buttons Available For Remapping in BTT" option.
Example Preset: MX Master
Here is an example preset for MX Master (3, 3S, 4) mice that you can import and adapt to your needs:
https://folivora.ai/releases/mx_master_example.bttpreset
Remapping Buttons
After you have added the Logitech Mouse Configuration, you should be able to record your buttons via the "Custom" click option:
Hover the click recognition area with your mouse, then press the button you want to use:
Afterwards you can assign any action sequence to that button:
Smooth Scrolling
BetterTouchTool supports smooth scrolling for any mouse, not just Logitech mice. To enable it add a Smooth Scroll Modifier
Trackpad Like Gestures (Zooming, Rotating, Space Switching)
Trackpad like gestures can also be configured via scroll modifiers: Scroll Modifier
Please come to https://community.folivora.ai/t/support-for-logitech-mx-master-mice/37397/78 and report any non-working mouse, I have mostly tested with MX Master and some G-series mice, but it is quite likely I have not covered all combinations.