Is it safe to set validateIntegratedModeConfiguration=false in order to continue using identity impersonate=true?
@GregT: Below is the link that answers your question
http://forums.iis.net/t/1150266.aspx
http://mvolo.com/breaking-changes-for-aspnet-20-applications-running-in-integrated-mode-on-iis-70/
As I understand that specific line of code is added up to log issues as errors and perform the necessary operation.