I’m running Qubes 3.1 on my Librem 13. The trackpad is recognized as a standard mouse, and is therefore not very functional.
The package in Dom0 is xorg-x11-drv-synpatics version 1.81,-g.fc20. I am trying to figure out how to install the xserver-xorg-input-synaptics package you mentioned above, but can’t seem to do so. I am also posting this on the Qubes Google forum, but am trying here as well.