Doh. I just downloaded the PF demo to try out and was surprised/bummed that my Wacom didn't work. Mouse pointer moves around as normal, but clicks/button presses are not recognized. Will there be Wacom support added? Unfortunately I can't buy this game if I can't play it using a Wacom. :(
This is similar to what happened after one of the recent CW3 updates. I had to roll back my installation of CW3 in order to be able to still play it using a Wacom.
https://knucklecracker.com/forums/index.php?topic=20306.msg141577#msg141577
I'm afraid the answer would be similar to that provided in the thread you referenced. Sorry.
All of the PF builds were built with a more recent version of Unity and thus whatever Unity broke will remain broken until fixed by Unity.