Tending pin from putt off of green. This is not a violation of the rules. You can have the pin tended regardless of where you are on the course. If they're partners on the same team, it's fair game and not a violation. This happens all the time.
All hazards are lateral.
Not knowing where to take relief from hazards, ground under repair, casual water and unplayable lies is a problem. And for some people, it's confusing to remember whether you drop within one clublength or two. If there's NO penalty stroke involved, you drop within ONE clublength of the nearest point of relief. Sounds fair to me. One which I plead guilty to right now is the 14-club rule.