No pathfinding in the EC (afaik), BUT if you right-click, then left click while holding down the right button, it will follow the mouse until you right click again.
Bug? Feature? The jury's still out on this.
Bug and the most annoying one there is! I hate it! Drives me bats.
As has been said, it's a feature, implemented to mirror the 2D client.
There is a problem where sometime it thinks you've left-clicked, depending on where your mouse is when you release the right mouse button. I think over containers or health bars cause this.
In both clients, this allows you to move as if you're holding down the right mouse button, while not holding it down. in the enhanced client, the movement behaviour that attempts to travel around obstacles can make it seem like pathfinding, but "follow cursor" would be more accurate to describe it.
Pathfinding is in the 2D client, where you double right-click and your character automatically moves to the point you clucked at, using some basic pathfinding code to find a path, while ignoring player input.
It's not a bug, it's a feature, and a very usefull one.
Just right-clic to have your character move, like always, then left-clic and you can release both mouse buttons, your character will now be on auto-run.
This is not pathfinding, and it's how it works in other modern games too, including WoW.
It's not quite the same.
In modern MMOs, the standard controls are that holding the right mouse button down looks around while facing your character in the direction you're looking, and the left does similar but without changing your character's facing. Holding both mouse buttons moves forwards in the direction the camera's facing (the same as holding right mouse and a forward key).
there are usually abilities to bind a key to toggle moving forwards, and sometimes I think to toggle the thing that the right mouse button does.