Problem
To my knowledge, there is no well supported way for an extension to contribute language specific settings, like so:

    "[markdown]": {
           "amazingExtension.enableUnicornMode": false
     }

This actually works, but has some major issues:

• There is no way to specify a language specific setting in the contributes section's schema
• Entering the above configuration produces a warning for users
• To retrieve the setting, you have to write:

workspace.getConfiguration().get('[markdown]')['amazingExtension.enableUnicornMode']

Proposals

• Allow extensions to mark settings as being valid language specific settings.
• Add apis for better working with language specific settings