How to set custom access denied pages in SharePoint 2013?

Hi everybody,

in SharePoint 2010 custom access denied or other error pages could be easily set by setting the new path to the webapp-properties by using webApp.UpdateMappedPage. In SharePoint 2013 this seems to be ignored. The MSDN-entry seems to be out of date and just copied from SharePoint 2010: http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.administration.spwebapplication.updatemappedpage.aspx

A possible workaround could be writing a HttpModule that checks the requested url for accessdenied.aspx and redirects to a custom page but there must be another more best practice way to achieve this behaviour??