I cant say that I have actually picked a kid up and moved them off the mat. But usually i get to a point where I get very stern in my warnings for them to move away sometimes to the point where I tell them they will be removed from the tournament if they return.
But yes I always have kids trying to sit at the edge of the mat, and I spend part of my days at kids tournaments moving people away from the edge of the mat. Its very annoying for me to have to, but i do it for safety reasons, and also because it puts the wrestlers at a disadvantage. I have to stop them before they actually reach the edge of the match to prevent them from running into those that are at the edge of the mat.