Is it possible, and how to implement it? :)

Yeah, not too hard if you're alright with some scripting.  I do it by simulating a mouse click so it can still be interrupted by "OnWalkTo" scripts, etc.

This code works in the UpdateInput function (if you have that in your global script, otherwise regular Update function is fine):

// First check if we should be able to move
if ( E.Paused == false && E.GameHasKeyboardFocus && E.GetBlocked() == false && Plr.Moveable )
{
     // Get direction from keyboard input
     Vector2 direction = Vector2.zero;
     if ( Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow) )
         direction += Vector2.up;
     if ( Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow) )
         direction += Vector2.down;
     if ( Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.LeftArrow) )
         direction += Vector2.left;
     if ( Input.GetKey(KeyCode.D) || Input.GetKey(KeyCode.RightArrow) )
         direction += Vector2.right;
      // Start moving 2 units in that direction
     if ( direction.sqrMagnitude > 0 )
     {
         Vector2 targetPos = Plr.Position + (direction.normalized * 2.0f);
         E.ProcessClick(eQuestVerb.Walk,null,targetPos);
     }
}