CS doesn't know 'who' will be eating a kid's meal when you order it. I often get one for myself because I tend to graze throughout the day, rather than eat a huge meal at once.
I have ordered kid's meals at both CS and, occasionally, TS with no trouble whatsoever. I should note, however, that I don't utilize the DDP. Too many rules for my taste.
Sometimes, I just want less food (and I'm a big guy), and sometimes, I just want a grilled cheese sandwich or some chicken fingers.
The CS restaurants are all set up like cafeteria's in that you go to whatever station you want to eat and order food, get your drink and then check out. The folks at the cash register don't care one ioda what your getting.