I noticed that striking a target that is not aware of your presence is still TN 2. maybe the rules should need a specification about that : if the guy does'nt even know you're there, maybe the TN should be lower.
And for the more unexperimented GMs, maybe it should be noted somewere that you do not need to roll the dices to kill someone who is uncouncious : the guy is sleeping, I don't see how you could miss his throat (by the way greate usefullness on the ''bayushi'' shcool here, for the lethality augmentation on unconcious targets). I know it's obvious but to some it will be their first ropleplaying game, so maybe it should be specified