Different settings for different domains using Multi-Domains /Domain Mapping plugins

Using Ultimate Facebook with Multi-Domains/Domain Mapping plugins, I can’t tell if the default plugin is setup once on the primary domain and the secondary domains get everything from the first.

For one, I am able to edit settings on the secondary domains under Ultimate Facebook. But it pulls in both App ID / API key and the Secret key from the primary install. Can I change this AND? / OR? any of the settings for this plugin?