In no particluar order:
Strength, conditioning and agility program for pitchers, off season and in season. Should include guidelines for limits on lifting for younger players, i.e. 14yo freshmen.
Policy on how much throwing two way players should or shouldn't do during practice in addition to pitching and bullpens.
Policy on integrating throwing done with a pitching instructor into school's throwing and pitching work. Tough for some pitching coaches to deal with but hey, it's a reality.
Policy on integrating summer teams, showcases, etc. with school teams during off season. (HS team should come first for the player, the player's development/future should come first for the coach as long as it doesn't have a negative impact on the rest of the team. For example, I plan on signing CASon up for a showcase that conflicts with a winterball game. He'll honor the winterball commitment even if it means missing a day of the showcase or not being invited to the showcase. My guess is that as long as he's up front with the coach there'll be no problem unless they're short on pitchers that weekend.)
Throwing program per deemax's suggestion. I'm a big advocate of long toss to build arm strength and endurance in the off season during a period of no pitching in games.
Mental toughness discussion per Texan's suggestion.
Description of bullpen routines, when to implement them and what the pitcher is trying to accomplish with each different routine.
Policy on being honest about telling the pitching coach how the arm is doing especially when there's pain. Should include being honest about innings thrown outside program. Pitchers, especially the younger ones, also need to inform the coach if they start feeling lower back pain.
I liked what I heard at one college camp and that was when things aren't going well don't try to make changes, just get back to the basics that got you where you are.
Policy on maintaining high academic standards.
Policy on behavior on the field, especially when the defense is not playing well or a pitcher is being squeezed by the ump.
Policy on behavior off the field, i.e. representing the school and the program.
Description of pitcher's fielding responsibilities, i.e. covering first, bunt coverage, backing up throws, holding runners.
These days a policy on immediate dismissal for use of PEDs.
Since BOF has identified me with the topic in the infamous fruitcake thread, a discussion of first pitch strikes and staying ahead in the count.