It's not necessarily the MSC but the client that determines if the shop is kid friendly.
Servimer offers valet parking and parking garage shops. Kids are allowed on these shops. My kids have played at just about every park near the Mag Mile in Chicago (and have their favorites places for me to park that correspond with their favorite park! )
I know of quite a few ACL shops that do not allow a child, and even an Amusement Advantage one!
Check with the scheduler to make sure it's allowed if not stated in the guidelines.
I just look my kids to see the Addams Family today with an Ace shop....