Hi
I know lots of people who count the superfree that's in the dish if there is plenty as their third.
I personally always add vegetables or salad, as it makes me portion it right and fills me up so I am not eating too much pasta/rice etc (if I don't like having salad on the same plate then I still portion the pasta as a third, sauce as a third, then have the salad as a side on a separate plate or in a bowl).
However, I don't think there should be any problem with you just having the vegetables you included in the sauce as your superfree. I think it's just a case of not eating more pasta than you need in my opinion
Marie xxx