windows phone Capacitive buttons

Just noticed how much easier it was for my niece to play games on the iphone...but when she played on my hd7, she kept hitting the buttons...shes 4. i know i hit the buttons by mistake alot too, but it doesnt bother me. However, i do think this should be looked at. Perhaps what they can do is add a button that locks out the capacitive touch buttons. This would help new comers and old users alike from getting confused with the incidental button push. Wp blue fix? Also, for android users out there, do u all hit the buttons by mistake alot too?