You need rcon for this.
As we all know that we can use gamemodeproperty rcon command to change the game.ini value in game.
Here are a list of things for gamemodeproperty and you will find it surprising.
TeamInfoClass
AIDirector
ScenarioPendingSublevels
LocalizedRules
INSGameState
AIDirector
Taglines
GameModeTagName
LastWinningTeam
MultiplayerGameState
InsertionVehicleSpawners
SoloReinforcementSystem
CounterAttackDefinition
OptionsString