For mod pack makers who have locked down the RTG world type, it would be good to disable it so their users don't get confused since they won't be able to choose the world type anyway.

Or modpack authors could just include settings.rtg which would have the same effect.

An alternative strategy would be to add a config option, such as B:"Display WorldType Screen" that defaults to true. So when a new config is created the WorldType screen will be displayed, and instead of creating settings.rtg so that it only displays once, have the method instead change B:"Display WorldType Screen" to false. This way it will only display once if RTG needs to create a new config file.. most modpacks will ship config files, so this would already be disabled in those cases.

Including settings.rtg wouldn't work as there's a string that gets written inside the file that's user-specific, so even if the file is there, it won't have the user's encoded string thing (I think it writes the profile id in everything prior to 1.10.2, and then in 1.10.2 it writes the username cuz the profile wasn't available anymore (or something like that)).

Could maybe try the writing-to-config file thing instead of settings.rtg though.

Including settings.rtg wouldn't work as there's a string that gets written inside the file that's user-specific

Is that data actually checked against the user to determine if that screen should be shown? It seems daft to do that since the file will only exist in a single user's client anyways, so there wouldn't be a reason for the mod to check against any user-specific data. I assumed the only check that was made was that the file existed, which is all that would really need to be done. I wonder if @Adubbz had other plans for this in BoP.

Could maybe try the writing-to-config file thing instead of settings.rtg though.

This makes the most sense, because it will be in the config file where people can see it, and we won't be cluttering up the Minecraft root with unneeded files.

Added in ed313d4 - just went with the config option to enable/disable.

Fixed for 1.8.9 in 58bf5e4

Fixed for 1.7.10 in eb53169