base tricking?

[mom and assistant coach]

I have a question about Little leauge baseball for 10-13 yea olds. We have a championship game tonight and I have been told about a "ball holding" tactic that we might be able to use. A runner is on a base and the baseman has the ball, time out is called and the ball is walked back to the mound.But the ball is not given to the pitcher, but is kept in the glove of the baseman and brought back to the base. When the runner leads off early, before the pitch, the baseman tags the base and or runner, making it an out. Can this be done? Is it in the rules? I hope to get an answer soon, because this is our last game and I want to make sure incase it is used. Thank you