I do not know if there is a way to add this, but I tried the MATE desktop version and when I tried to change settings for the touchpad. For example change the sensitivity and acceleration for the touchpad, turning on Tap to Click, etc.
I was able to change the libinput file to enable Tap to Click but when I try to turn down the speed of the pointer with another config file, it cancels it out.
I just wanted to let you that I found this was happening.