Here is a workaround...
You need XLib dev files and cmake to compile it.
mkdir scroll
cd scroll
tar -xvpf ../scroll.tar.gz
mkdir build
cd build/
cmake ..
make
Now copy unityscroll and unityscroll.sh to your PoE folder (for steam: SteamApps/common/Pillars\ of\ Eternity/)
and run unityscroll.sh to start PoE.
Dont forget to disable Screen Edge Scrolling in game.
scroll.tar.gz