Renamed config interfaces properly with Section suffix, re-implemented the For<T> UmbracoConfiguration method to retreive specific settings... might use this entirely instead of the nested access as it might make it easier to mock.

src/Umbraco.Core/Configuration/BaseRest/IMethodSection.cs

@@ -0,0 +1,17 @@
+namespace Umbraco.Core.Configuration.BaseRest
+{
+    public interface IMethodSection
+    {
+        string Name { get; }
+
+        bool AllowAll { get; }
+
+        string AllowGroup { get; }
+
+        string AllowType { get; }
+
+        string AllowMember { get; }
+
+        bool ReturnXml { get; }
+    }
+}