A lot of people are up in arms about others cheating to run a BQ, and thus keeping someone else out of the race.
I propose we have let every runner have one opportunity to cheat in a marathon, free of any consequence, some time in his or her life. You could use it to set a big PR to show off to friends, run a BQ time, an OTQ time even!
If you're already an Olympic Trials qualifier, you could cheat at the trials and get top-3, if properly executed. No one could tell you that you couldn't, as long as you hadn't used your cheat pass on an earlier race.
How would you use yours? I don't think I'd be too greedy, maybe just use it for a top-10 at a WMM.