Can anyone confirm that this workaround is applicable (and has no other drawbacks else than clicking on the extra button 100 times per hour - which i would prefer to reaching over to wasd on keyboard)?
If so, i would buy a multi-button (>2) mouse extra for this game.

https://steamcommunity.com/app/1086940/discussions/0/3808408328760887569/?ctp=2

the author writes there:

SOLUTION:

I assigned my MouseButton4, to secondary "Move Camera Up" keybind. Or any camera movement shortcut in this case..
Now when the camera locks, I simply click that button and it moves the camera manually so the edge panning starts to work again.