I'm for letting the kids play, but feel I need to ALWAYS flag the following :
(1) If safety is involved, a flag on a late hit early in the game often prevents later hits later in the game.
(2) If an advantage is gained by the fouling team. If holding opens a hole for the runner, it will draw my attention more than one that occurs on the opposite side of the field.
(3) The obvious fouls. Big Ole' Bubba tips over into the neutral zone. Everyone saw it, I did too.
Use common sense and the game will go much smoother.
PS : In the OP, I would flag kicking the ball if it was just sitting there, but would not if the holder had his hand on top of it. I would then congratulate the offensive line for holding their blocks long enough for this to occur.
DISCLAIMER : Only my opinion, not that of any organization ,political body, or country.