movement issue, awsd and mouse movement should be improved

I was always playing with mouse movement and now I have the problem at the endgame boss "arbiter of ash" that I am moving often too far away of where I have to move and instantly dies. This is because when playing with mouse i normally click behind the target just to move to the right direction. My wish is to have a awsd keyboard movement in combination with mouse movement (with the left mouse button).

When playing with awsd I can't attach simple movement to the left mouse button, I only can remove the attack skill of the left mouse button but cant apply the move only to it (which is possible in poe1). In normal maps I want to have lazy movement with the left mouse button and also want to be able to move with awsd.

Now I am ending with playing certain maps in the awsd mode and have to switch to mouse movement when playing simple maps. This is annoying.

Best regards...