@Taran
Using just one attack with a two target-spray and two attacks, and assuming equal rolls then you're correct. My thought on that would be since there is a roll already in place for multiple attacks (the spray rules) to disallow attacks from multiple main actions. That would leave attacks (and their rules, Stunts, and Powers) out of it.
@Sancta
Earlier, you had suggested applying spray like rules to this rule. How do you conceptualize that?
#Action Cap
Another way of ensuring this wouldn't get out of hand would be a cap on the actions of some kind. Ultimately, in narrative turns, there is only so much one person could do (naturally) in a single turn. I'd rather not give a hard number and instead leave it up to GM ruling, but what do you all think?