When I coached rec many years ago we went to similar rules because the games turned into walkfests. Kids get turned off when the game is dominated by walks. We would sometimes let the kids pitch the first two innings and then would have the coaches pitch after that. The funny thing about having the coaches pitch is that some of them weren't a whole lot better than the kids. I'm coaching a charter school varsity now and we had to use our second pitcher, it reminded me of my rec days. In 5 innings she had almost 20 walks. I ended up bringing in a lob baller for the last 2 outs. Two and half hours for 5 innings.