i can't speak for anyone else but myself. but i am willing to answer your 5 questions.
Q1: talk with them, find out as much as possible and educate them on why that will not be tolerated.
Q2: suspension period - no excuses for cheating.
Q3: a little extra running is always a valid incentive to showing up on time.
Q4: again i'd talk with them and see what is going on in their lives and help to become more productive.
Q5: i listened intensely while they are talking, then explain to them why i made the decisions i made.
now i may have taken my job more seriously then some - but giving them the best experience possible and nurturing them into contributive members of society - while improving their atheltic skills was my overall goal.
for sure things happen all the time, and they always will, however all that really matters is how they are dealt with.