Powershell httpErrors lockAttributes

Hi ,

Im having some problems trying to change the lockAttributes for httpErrors using powershell, perhaps someone out there have figured this out already

I know all i need to do is change the following in the applicationhost.config

from

 <httpErrors  lockAttributes="allowAbsolutePathsWhenDelegated,defaultPath">

to

 <httpErrors  lockAttributes="allowAbsolutePathsWhenDelegated">

But id like to be able to do this using powershell v2,  to keep continutiy in by site bulding scripts

All suggestions, advice or pointers are welcome

Thanks