Powershell remoting as non-admin on windows server 2003

I am trying to do powershell remoting as a non-admin user on windows server 2003. I have enabled PS remoting and given the user permissions along the lines discussed in 

http://blogs.msdn.com/b/powershell/archive/2009/11/23/you-don-t-have-to-be-an-administrator-to-run-remote-powershell-commands.aspx

with the cmdlet.

Set-PSSessionConfiguration -Name Microsoft.PowerShell -showSecurityDescriptorUI

Now, I can user Enter-PSSession or Invoke-command and run powershell cmdlets fine as non-admin user.
But cannot run native commands eg. ipconfig or cmd /c ipconfig.

I get Access Denied error (Fully qualified error id: NativeCommandFailed.

But when my target server is 2008 R2 I can run any command, batch files and even vbscript files.
Is there some extra setting in windows server 2003 that has be enabled for non-admin users remoting privleges to be complete.