Yea, having different rules only helps for isolating issues. That way if you have multiple devices, and want to port forward Port A to device 1 and Port B to device 2, you can just change how they are clicked off and reboot. If its all under one rule you cant.
But I don't the answer to the fallowing questions:
1. Are you trying to play one 3 computers via 1 account? If so, as freggboy said, thats no good.
2. Have you tried UPnP?
If you have multiple devices trying to play on server, then you need to use UPnP, or use port triggering (which is really messy). I highly suggest UPnP. But if your using UPnP, you can't really use Gamefuel like you normally would. What you can do is use Gamefuel to increase the priority of other traffic (say port 80) to other computers other then those. But that would only help if they were trying to use their computers while you tried to game on 4 PC at the same time. And to be honest, if your trying to game on 4 PCs at the same time, you should just tell them to stay off the net while you do it, because your pushing your router hard.