At Stars in the main, the blue flag is the removal flag. Once you see the blue, you report to the pits. Failure to do so and they stop scoring you at all. It is used as a plow for the leaders. It may remove as many as half of the racers.
I would not advocate that here. I do not think its fair. The slower guys paid their money, they deserve as many laps as they can. I do greatly respect it that they don’t try to “race” the leader, or second or third for that matter. Like Tyson pointed out, you don’t have to get out of the way but you can make it easier. I do like the finger approach ( not the index finger) but I’ve seen too many times a heated battle for the lead get ruined when the lapper lets one by and chops off the second guy. Its not intentional and he knew there were two, it might not have happened.
Just remember, the fast guys are not going to be patient about getting by. They will not follow for a lap or even a few corners unless they have to. If they do have to follow for a bit, they may not be too polite when they finally get around.