In a public servers environment there has always been an issue trying to detect which player is deleting important markers or which player is creating unwanted markers.
This typically occurs during the briefing stage of a mission but also happens ingame.

It would be extremely helpful if we as server admins can detect which players are carrying out these unwanted acts so we can deal with them appropriately

Solutions that come to mind are
a) A systemchat message to the admin
b) Eventhandlers "MarkerCreated", "MarkerDeleted"

SYSTEMCHAT
systemchat format ["%1 has just deleted a %2 %3 marker labeled %4"]
%1: Players name
%2: Marker colour
%3: Marker type
%4: Marker Text

EVENTHANDLER
Returns
Name of player who created it
Marker Type (Classname)
Marker Colour
Marker text
Marker Position
Marker Scope (e.g. Global, Side, Group etc)