The Modify Server Config button is great. Makes customizing a lot of setting quite easy. However, there's a lot of new options and some older ones that are not available. Makes it a real pain in the ass, because some of these setting go in gameusersettings.ini and some in game.ini. Getting it wrong either does nothing, or can have undesirable side effects.
Examples:
AllowAnyoneBabyImprintCuddle=true (allows anyone in your tribe....actually any player at all....to walk and/or imprint baby dinos. Extremely useful when you just can't stay up any longer to watch the babies.) Not added to MSC setting. Fairly old now, been around since 243.0 or so. Goes in gameusersettings.ini
ShowFloatingDamageText=true (allows floating damage numbers on hits) Goes in gameusersettings.ini
FishingLootQualityMultiplier=1 (1-5, sets lootquality). Goes in game.ini. SupplyCrateLootQualityMultiplier=1
bAllowUnlimitedRespecs=true (allows more than one mindwipe use per level). Goes in game.ini.
bUseCorpseLocator=true (places beacon on player corpse until collected or timerdecay occurs). Goes in game.ini.
bDisableStructurePlacementCollision=true (allows structures to clip into terrain) Goes in game.ini.
I had to google each line here and figure out where it went. Placing them in both files apparently did nothing. It'd be useful if they all get added to the MSC tab at some point. Especially the modifiers that require placing in game.ini, you can't get those to work by simply adding them to the custom ini box at the bottom of the MSC tab.