Your original post asked if anyone had thought of doing this, and said that you called Disney, the CM put you on hold (supposedly to check with a supervisor, but no way to know if they did), and came back and told you, no you can't. Other people have said that they were able to do this.
I explained
why I am surprised that Disney would allow it during
free dining. I did not say you were "cheating the system", and I don't feel I'm "holier than thou"

I just said that financially for Disney, it doesn't make sense to allow it -- and if you do the math, it doesn't make sense

. If a lot of families do this, it will cost Disney buckets of money. But maybe they have so many buckets of money that they honestly don't care.
When guests were using kids' TS credits for adult meals -- based on advice that was given in guide books, online, and reportedly even by CM's -- Disney cared. It ended up costing them so much money that they revamped their computer system to prevent it.
The same thing is happening with CS meals, but so far there is minimal enforcement, and Disney isn't shelling out the cost for another programming change. So while it might not be what Disney intends for people to do with CS credits, so far they don't care enough to spend the money to make sure it
can't happen.
Disney has told several posters in emails that 2 adults can't share one TS meal on the dining plan -- however, it seems that most CM's at most restaurants override that policy, because a lot of people share meals and it hasn't been a problem.
So, if "aging" your kids to get adult dining credits for them during free dining becomes a big enough issue for Disney, they will stop it from happening. Right now, it's a little ambiguous, since there is nothing in writing, and especially since so many CM's are telling people it's just fine. But if I opened up a thread asking for opinions on a topic that might be a bit uncertain, or even controversial...I wouldn't be too surprised if I got opinions from both sides of the fence