The above ties in very well with my thinking. If you are in a real bind surrounded by enemies you can go for a targeted area attack, and if you roll a 20 stun everyone.
Unfortunatly I don't think that seperate attack rolls works either because then you are letting the averages work for you, I have 10 valid targets so I am reasonably likely to critical at least one of them.
This is a great shame because I think Targeted area is a great way of moddeling a speedster who runs around in a circle slapping everyone he passes, among other things.