I was hoping to see MacOS style three-finger drag being available through this. Unfortunately, it will technically most certainly not be possible to augment it this way, and the maintainer of libinput considers three-finger drag as a luxury that will introduce unnecessary overhead and complexity.
Three-finger drag is IMO one of the most helpful usability features of MacOS, and I miss it dearly every day since I bought my XPS 13.
Edit: ... which is not the fault of the developer of this tool. Good job, I like the spirit and think this is incredibly useful and powerful.
The tool could further make configuration of the most common use cases simpler IMO. Not every user is keen or able to enter the specific commands.