When I'm playing with my Pala/4xShaman group what I do is have the WASD keys set on the block list in Keyclone but keep the cursor keys free-to-pass. This means that just before my Pala's going to run into the mobs I can just tap a cursor key and the Shamans all step slightly and stop following, leaving the Paladin free to move as they want whilst the Shamans stand back and nuke. Another slight advantage of this is that I can use the left/right cursor keys to rotate the entire group turret-like on the spot to track enemies when they run past.. I may not get them in line with all chars but 2-3 is normally the minimum, and is enough in most cases.