Is it possible to configure Karabiner (formerly keyremap4macbook) such that clicking the 3rd or 4th mouse button (on a trackball mouse) will toggle using the pointer to scroll?
Ideally I would like to be able to click the 3rd mouse button, after which moving the trackball will scroll (a webpage or whatever else is on screen), and will return to moving the cursor after the 3rd mouse button is pressed a second time.
I know it is possible to use the trackball as a scroll wheel while a key or mouse button is held down (see this answer), but that is not what I'm looking for. Thanks!
Edit: This is basically a request for a Mac version of the accepted answer to Remedy for a no scroll wheel trackball? which is only applicable to Linux.