A way to hide markers done by a player, and a way to see them if needed.
If a player is making unwanted markers during a mission, it would be nice if the admins/GMs could flag said player so that the makers made would be hidden by default, but could be made visible to count as evidence for unwanted behavior.
I'm imagining this being done by script calls, no need for special interfaces, as this would be done by administrators only.
We could have an additional column in the DB, since SQLite is fairly easy to edit using tools like SQLiteBrowser, that contains a comma or semicolon separated list of 'names' that should be blacklisted from having their markers displayed during playback. We can import that data with the other recording details, and omit those markers from being created. Name would match whatever the player's name was during the recording.
This would prevent having to modify scripting in game, preserve our minimalist JSON format, and allow administrators to more easily blacklist specific recordings with undesirable markers.