You can exclude players from the stats reports via a new "Hide" switch in the player record:
It works with the majority of player-based stats reports. There may be a few reports where the Active filter isn't enabled where this won't have any effect.
It is aimed at allowing you to filter out any placeholder player records that you may use for when the actual player is unknown or unregistered.
What it won't do:
It won't hide the player from displaying on any match report
It won't hide the player from the player selection drop-down when entering scorecards
I have gone ahead and applied it to any player records that have a last name like "unknown" or "unregistered" and no first name or "player" as a first name.