I think it's silly that it's against the rules.. if I'm not cheating so what if I can split my brain?? I had played Slushie Slingers and MSN and SOS (alternating between the two) cause I just didn't have time to play them all (which it's ridiculous to get what you need to reach All Star as is), but had to stop as I didn't know it was "against the rules", I just find it dumb xD
TNT always has those little quirks though, rules that ruin things for everyone sometimes haha Oh well.