Add ability to add players statistic (not events) in match.
Such statistic could be divided into categories (can be simplex or composite), for all players or assigned to specific player roles (select type player extra fields)
Entering such statistic should be easy - you have a list of players in match details in backed and can enter such data for many of them simultaneously.
So match moderator can have a long tables with the appropriate statistic for each player.
On front end it will be similar to those pages