This is an area that baseball is lacking very much. What needs to be done is a lot of individual and small group teaching and drills. I am obsessed with this as the players want to keep moving and being pushed with enthusiasm and high expectations!
We need to have as many coaches as possible and at times the whole field being used. I use to look at my players and say, DP I want you to be the best shortstop that you can be. Jeff I will work you to be the best catcher that you can be. We do this with a lot of individual drills with hustle and enthusiasm. Your goal is for each player to be the best he can be individually, and then you put your players together to play as a team.