Yes, this is possible. I did it for my character and did roughly 80% of my progress for each this way.
I did it in the sunken quarter of Yalahar, there's a building for the "Shadows of yalahar" quest there. It's 5 spaces wide and you can just walk back and forth on your own fire fields there.
Personally I did it manually but from what I hear a lot of people do it by binding a mouse button to walk and apparently it's possible to hold one walking hotkey on mouse and opposite walking hotkey on keyboard to permanently walk back and forth. You'd still have to refresh the fire fields.