As a longtime (former) Warhammer player I've done this countless times. Maybe not at every little local store tourney, but at every event of any size or 'upper level event', lists have always been required early. Sometimes a month or two, depending on the event.
I would think that requiring X-wing lists to be submitted a few days or a week prior to the event should be easy to pull off. I speculate that the vast majority of players know what they are going to fly long before the day of the event. Especially at an Organized Play event.
There was no cheating involved here. Players used a recent rule change sanctioned by FFG that even included a precedent set at the Hoth Open, an approved draw that locked two players into the Top 8 when it was likely one would have been eliminated.
The cheating would be any collusion, or prior discussions that were had, before the situation actually occurred. The ID rules are clear in that any discussions regarding an ID must be had in front of the TO. If there was any discussion about IDs beforehand then cheating occurred.
Edited by thatdave