"set needed zoom/pinch amount" doesn't seem to do anything

Describe the bug
It's not really a bug, it's more like a feature that does not seem to actually do anything..
Its the "set needed zoom/pinch amount" which I wanted to set to a high value because I use my trackpad as a volume knob and most of the time (as I use Safari) when I fiddle with the volume, it zooms out into tab views, which I hate! But I don't want to disable zoom I use it a lot to zoom in on pages, but I have tested the slider's effectiveness with Preview, as well as Safari and it doesn't seem to do anything at all, I don't notice any difference between before I set to a high setting or lower.. Maybe I doing something wrong like there is a setting that I should be turning on before using that, but the "rotate" sliders work just fine, so I don't really know...

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

If applicable, add screenshots to help explain your problem. (You can just paste or drag them here)

Device information:

  • Type of Mac: Macbook Pro 2018 with touch-bar
  • macOS version: Mojave 10.14.2
  • BetterTouchTool version: 2.667

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

Note: Before bug reporting, please make sure you have the latest version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.