There are obviously a number of different ways this can be done. One is for this processing to be done inside the core processing or another way is to extend the PUArcade system plugin to listen for new highscores events and process the leaderboard that way.

What I was thinking of was..

1. plugin is extended to include this functionality based on the highscore event

2. admin control panel has a button which can completely rebuild the leaderboard if necessary.

Not sure about the timing element yet, because there are potentials here to further enhance the security from false scores.

Also, as Pragma is the boss - I think I need to discuss this all with him first!!