I wrote a wizard the simulates GCPs movement keys with the arrow keys. Whoever you are moused over will move with arrow keys and if you hit shift with a movement key it will move everyone else.

1. Download the attached file
2. Place it in C:\GameCommanderPro\Game Support
3. In GCP click Setup
4. Select ArrowMovement
5. Run ArrowMovement

This wizard works if your movement is bound to the arrow keys in WoW.