How do you handle mounts, then? If you do it differently, how do explain the inconsistency or do you bother with it? More importantly IMO, why is it random? Why not choose a square (even if initially random) but then allow people to target that square? The reason why this is important is for justifying melee attacks. Note also that your rule may actually disallow a melee attack (consider a medium creature in an non-adjacent square to another attacker while grappling a large creature).
Well, of course, but it doesn't hurt to discuss it. I was happy with my 26 inch CRT until I bought my Home Theater System.