Stevenson- here are some thoughts:
About the hours- I have never had (nor anyone else that I have talked to) had a problem with thieves. That's one good thing about living in the country. My driveway is nearly 1/2 mile long, and everything from the main gate in is wired so hot that if someone throws a stick on my property I will have video evidence of it. I am not a paranoid freak, we just have a lot of good equipment and nice horses, and I don't want any problems.
The trainers is one of my main problems. Not sure if I should hire my own, or let people choose. I don't want to force people to one trainer-just because I like him/her doesn't mean someone else will. And I wonder if there could be some kind of chart made to sign up for a 'lesson time' with a trainer? Or if that would even work.
And pens with stalls- definitely yes. About the shavings/straw-either would be fine. Right now my horse stalls have both. Rubber mats on the bottom, then shavings, and straw on top. (I have a few picky horses, and straw is dirt cheap where I am.)
About the locks- on tack lockers, for sure. And I would just have the master or a second copy in case of emergency. On the stalls- I am not to sure. I don't want people messing with other's horses, but I don't think that I would have any problem keeping that straight.
I agree with no tying in the barn isle, and the turnout of horses. And the boarder-meets-their-own-vet is a good idea to. Farrier as well. Also, I want the boarders to trust my vet and farrier on their own accord, instead of just taking my word for it.
American by birth. Cowgirl by the grace of God. And I wouldn't have it any other way.