I am the OP. I appreciate everyone's interesting and thoughtful responses on this subject. I am always very grateful to everyone who posts on this Board as a source of info, and my sole purpose in posting my story is to let people know that at least some restaurants are looking at the number of people on your card and enforcing dining plan utilization based on that. Based on my own experiences, this definitely is not being enforced across the board. One a couple of occasions during our trip, our group used a CS credit for a meal to be eaten at that time and ordered additional CS meals (sandwiches) to eat later in the room. So on one tab we were using maybe 6 CS credits at a time for our party of 4, and there was no restriction placed on that. I also "paid" for another meal for a friend at Chefs de France and the appropriate number of TS credits were simply deducted, with no reference made to party size.
It was never my intention to "scam" - I had understood that you could use your credits "as you wished." I did not understand non-transferrable as referring to an individual meal eaten by someone dining with you, but rather to the whole plan. If I misinterpreted that, it was my mistake and that's fine. But even if that is the policy, I don't really understand how paying for a friend with your credits could be a "scam" - if I didn't use a that credit to pay for a friend's meal, I could have used it at that or another restaurant the next day for a meal. In terms of cost to Disney, its the cost of a meal - what's the difference who actually eats the meal? It is a violation fo the policy if I buy two sandwiches using CS credits and then give one to my friend who meets us in the park? Is that a scam? We didn't get something for free.
My issue with the manager at Yachtsman was twofold: (1) he displayed a very poor attitude and was rude. Regardless of how he feels about dining plan utilization, it was very inappropriate for him to insult me with his analogy about a repeat traffic offender. Just an insulting and completely inappropriate analogy. That is not how custumers should be treated anywhere. He tried to backpeddle and apologize after I called him on it, but his meaning was clear. (2) his explanation was inconsistent as to why we couldn't use the remaining two credits. He claimed that it was about the party size on our room key, but he kept fixating on the idea that we were trying to use a "child's credit" to pay for an adult meal. He said something like "you know that there is a big difference in cost between chicken fingers and filet mignon." Well, duh! That seemed to be his real issue. I personally believe that if we did not have child on our dining plan, but had simply had 3 adults listed on the card, and then tried to buy 4 adult meals with our remaining 8 "adult" credits, this manager would not have had a problem with that. I can't prove that, of course, but his real issue seemed to be his accusation that we were trying to use my son's credit to pay for a filet mignon at his restaurant. (of course, he admitted that he had no idea and no way of knowing or tracking how we had used the child/adult breakdown of credits during the 8 days we had been at WDW, but that's another story).
I agree with the poster who said that we probably could have asked for 2 checks and the other adult in our party could have presented her card to pay for 2 of the meals and we would have been fine. I'm not saying I would have done that, but that example and the one I gave above just shows how arbitratry the enforcement of these supposed rules is.
SO, again, the only point of my post was to let people know that there may be a "crackdown" in place, or whatever you want to call it. I do not believe that I was trying to do anything wrong, and was merely trying to use credits that I had saved in good faith by paying OOP for other (cheaper) adult meals we ate in previous days. But if WDW is trying to take away flexibility by monitoring who eats the food you purchase with your credits, I accept that - just good for everyone to know and plan accordingly.