After reading the post - it was not clear about what if any software the player was using. I am always weary about using mouse/kb hooking software (although I ran Synergy for years while I played without any problems)... that said Synergy has exactly 0 abuse potential and is used by a ton of people to admin multiple machines - not at all uncommon when you consider the subset of player who plays WoW - not exactly your average computer user, so therefore likely to have multiple computers.