I always offer to talk photos for families sitting around us. People do the same for us. It is sometimes the only way to get my entire family in a shot. The tables are pretty close, so I am sure you won't have a problem if the CM is busy. Have a great meal!!!!
I had lunch at Akershus last Thursday and found the whole experience delightful. I am sure that the CM's would take a quick photo for you but, like the poster above mentioned, I saw several families admiring each other's little princesses and helping with group photos. I saw one family take pictures of two little "Cinderellas" and offer to email a copy to the one's Mom.