Avoiding PageParserPath but still having code in your page layout

Question

I have a page layout that has some custom c# in it (yes, I realize that's not a great practice; it's some legacy stuff I don't have time to rework right now).
I have this page layout deployed in our farm today... and it works just charming...  *and* there are no additions to our <PageParserPath>.  So, such a thing is possible, that's good news!
Anybody know how? :)
There is some (rather logical) explanation here http://msdn.microsoft.com/en-us/library/bb964680(v=office.12).aspx that suggests that as long as the item remains ghosted
it's "safe".  But, after deploying from my fancy .wsp with the type set "GhostableInLibrary" ... I got the ugly "Code Blocks Are Not Allowed In This File" madness.
Hmm... starting to wonder if I am crazy for thinking this could work w/ a Sandboxed solution?  Or... or theories?

Answer 1

Yes, it is possible in SHAREPOINT 2013, but with some
hacking.
1. create custom configuration handler class
public class MySafeModeConfigurationHandler : IConfigurationSectionHandler
        public object Create(object parent, object configContext, XmlNode section)
            var type = typeof(Microsoft.SharePoint.ApplicationRuntime.SPRequestModule);
            var field = type.GetField("s_excludedFileList", BindingFlags.Static | BindingFlags.NonPublic);
            object s_excludedFileList = field.GetValue(null);
            if (s_excludedFileList == null)
                field.SetValue(null, Activator.CreateInstance(field.FieldType));
            type = Type.GetType("Microsoft.SharePoint.ApplicationRuntime.SafeModeConfigurationHandler, Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c");
            var method = type.GetMethod("Create");
            object o = Activator.CreateInstance(type);
            object result = method.Invoke(o, new object[]{parent, configContext, section});
            return result;
2. change web.config
      <!--section name="SafeMode" type="Microsoft.SharePoint.ApplicationRuntime.SafeModeConfigurationHandler, Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" /-->
      <section name="SafeMode" type="MyNamespace.MySafeModeConfigurationHandler, MyLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=fc475d95eb56414f" />