So here's a senario...
You are rebuilding your line due to vacation. Who's going to be the judge and jury, when you pick up time from line completion/opentime. Or swapping trips for an addtional couple hours of credit.
You cannot predict how many of your requests for line completion will be successful. Maybe you get a few too many requests granted and make 90 credit...
How about a change in training. You lost credit and need to rebuild your line. Making a list of people that pickup opentime is just a one-sided story and irresponsible.
Your going to make everyone explain themselves? Hopefully not... How about, just try not to take advantage of the people on the street. And, do the best you can.