we have minors at all of our projects. usually there's no special
consideration, but for formal programs (earn a bike, after school, etc.) we
get them and the 'rents to fill out a medical info/consent/waiver thing.
never had to use one, but the lawyer in me and the bod feels better if we
cover our butts the way everyone else does, our insurance guy appreciates it
and a couple of funders have asked about it. i could post a copy of what we
use to the wiki but its pretty standard fair.
as to your second point, there's a list of "10 commandments" at the shop
that can be pointed to with an "oy!" when a custy gets out of line (again,
standard stuff like "let us know beforehand if you're broke", "respect the
staff, other customers and tools", and "if you have a question about how we
work, ask us"). at the workshop where i work, we get participants to come up
with a list of rules and guidelines at the begining of each earn a bike
class that they all agree to abide by, and stick it up on the wall for the
duration of the class. they rarely miss anything important, and if someone
gets rowdy it seems less authoritative when you can remind them that they
agreed to the rule they're breaking.
pedal bike depot