unfortunately i have not found a way to target the soul-trader, i just have my IWT /assist my main, manually target trader on main, then hit IWT. using the mount obidian nightwing works better since you can just have them target your main, but soul-trader is only indoor solution i've found.
I'm primarily doing pve right now, going to see if i can farm justice points to transfer for the honor gear, then i'll do arenas :]