Doesn't matter the number of input devices. The TouchPoint, Trackpad and an logitech unified mouse adapter works perfect fine with 0 configuration.
The Helix has a wacom digitizer, as well as mouse input - so it's really two additional inputs. There are drivers I previously installed per Arch packages when I had arch on it:
xf86-input-wacom
https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_Helix
Do we have to build them for dom0 or usb-vm?
Thanks!
-E