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/BaseRestSection.cs

@@ -4,19 +4,12 @@ using System.Configuration;
 namespace Umbraco.Core.Configuration.BaseRest
 {
     [ConfigurationKey("BaseRestExtensions")]
-    internal class BaseRestSection : UmbracoConfigurationSection, IBaseRest
+    internal class BaseRestSection : UmbracoConfigurationSection, IBaseRestSection
     {
         private const string KeyEnabled = "enabled";
 
         private bool? _enabled;
-
-        //internal protected override void ResetSection()
-        //{
-        //    base.ResetSection();
-
-        //    _enabled = null;
-        //}
-
+        
         [ConfigurationProperty("", IsKey = false, IsRequired = false, IsDefaultCollection = true)]
 		public ExtensionElementCollection Items
 		{
@@ -36,7 +29,7 @@ namespace Umbraco.Core.Configuration.BaseRest
             internal set { _enabled = value; }
         }
 
-        IExtensionsCollection IBaseRest.Items
+        IExtensionsCollection IBaseRestSection.Items
         {
             get { return Items; }
         }

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

@@ -6,7 +6,7 @@ namespace Umbraco.Core.Configuration.BaseRest
 {
 
     [ConfigurationCollection(typeof(ExtensionElement), CollectionType = ConfigurationElementCollectionType.BasicMapAlternate)]
-    internal class ExtensionElement : ConfigurationElementCollection, IEnumerable<IMethod>, IExtension
+    internal class ExtensionElement : ConfigurationElementCollection, IEnumerable<IMethodSection>, IExtension
     {
 		const string KeyAlias = "alias";
 		const string KeyType = "type";
@@ -59,11 +59,11 @@ namespace Umbraco.Core.Configuration.BaseRest
 			get { return (MethodElement)BaseGet(index); }
 		}
 
-        IEnumerator<IMethod> IEnumerable<IMethod>.GetEnumerator()
+        IEnumerator<IMethodSection> IEnumerable<IMethodSection>.GetEnumerator()
         {
             for (var i = 0; i < Count; i++)
             {
-                yield return BaseGet(i) as IMethod;
+                yield return BaseGet(i) as IMethodSection;
             }
         }
 
@@ -72,7 +72,7 @@ namespace Umbraco.Core.Configuration.BaseRest
             return GetEnumerator();
         }
 
-        IMethod IExtension.this[string index]
+        IMethodSection IExtension.this[string index]
         {
             get { return this[index]; }
         }

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

@@ -2,7 +2,7 @@
 
 namespace Umbraco.Core.Configuration.BaseRest
 {
-    public interface IBaseRest
+    public interface IBaseRestSection
     {
         IExtensionsCollection Items { get; }
 

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

@@ -6,6 +6,6 @@
 
         string Type { get; }
 
-        IMethod this[string index] { get; }
+        IMethodSection this[string index] { get; }
     }
 }

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

@@ -1,6 +1,6 @@
 namespace Umbraco.Core.Configuration.BaseRest
 {
-    public interface IMethod
+    public interface IMethodSection
     {
         string Name { get; }
 

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

@@ -2,7 +2,7 @@
 
 namespace Umbraco.Core.Configuration.BaseRest
 {
-    internal class MethodElement : ConfigurationElement, IMethod
+    internal class MethodElement : ConfigurationElement, IMethodSection
     {
 		const string KeyName = "name";
 		const string KeyAllowAll = "allowAll";