StructureMap magic to make AppSettings suck less.

FeatureToggleRegistry.cs

public class FeatureToggleRegistry : Registry
{
    public FeatureToggleRegistry()
    {
        Scan(x =>
        {
            x.TheCallingAssembly();
            x.Convention<SettingsConvention>();
        });
    }
}

SettingsConvention.cs

public class SettingsConvention : IRegistrationConvention
{
    public void Process(Type type, Registry registry)
    {
        if (type.Name.EndsWith("Settings") && type.IsConcreteWithDefaultCtor())
        {
            registry.For(type).Use(typeof(SettingsInstance<>).CloseAndBuildAs<Instance>(type));
        }
    }
}

SettingsInstance.cs

public class SettingsInstance<T> : Instance where T : class, new()
{
    protected override string getDescription()
    {
        return "{0} from {1}".ToFormat(typeof(T).Name, typeof(AppSettingsProvider).Name);
    }

    protected override object build(Type pluginType, BuildSession session)
    {
        return session.GetInstance<AppSettingsProvider>().SettingsFor<T>();
    }
}

Web.config

Be sure to throw this in your config file
<appSettings>
    <add key="FeatureSettings.SpecialFeatureEnabled" value="true"/>
    <add key="FeatureSettings.SomeOtherFeatureEnabled" value="false"/>
</appSettings>