I have a comment on both your scenarios.
1.) Slow play, is not against the rules, other than the rules DO state you have to try and keep up with the group in front of you. If you can't, fine. I do not think anyone on this site would be upset if you are a high handicapper that cannot play at the pace of a low handicapper. BUT if a group is OBVIOUSLY playing faster than you from behind, IT IS A RULE that you MUST let them through. It is not our obligation convenience you because you are not following the rules. You have to convenience us, not because we are better players, but because the rules of the game you chose to play say so. Yes, you paid and can take your time, but we paid and have the right to play every hole. Remember, it is a rule.
2.) Driving slow in the fast lane, also a rule. Read the little white signs with black letters "Slower traffic keep right." Yes, we can go around in another lane, but the slow driver is the one not obeying the rules. Why should we have to convenience them?