If you want you can read the bulk of Tracy (Hey, I got a big hat!) Ringolsby's story in the Rocky Mountain News about the use of the humidor at Coors Field, but I was drawn to the last section.
NEW SWINGS: [Senior VP of baseball operations for MLB Joe] Garagiola [Jr.] said teams will adjust batting-practice schedules so fans can see the home team hit.
Garagiola said baseball will adopt the suggestion by Milwaukee Brewers general manager Doug Melvin that the start of batting practice be pushed back 15 minutes each day. Melvin said teams rarely take infield practice, so the time traditionally reserved for that will be eliminated.
"This benefits the fan because home teams usually have their batting practice sessions end when the gates are opened," Garagiola said. "Now, the home batting practice will extend 15 minutes into (the period when the gates are open)."
I'm not sure why it's inherently more interesting to show up early to a baseball game to watch the home team clout 75 mph fastballs into the seats to watch a team practice fielding, but I guess they have their reasons.