Setting IIS W3C Extended Log File settings via command line, registry or configuration file

Question

I am currently in need of a way to set IIS W3C Extended Log File settings via command line, registry or configuration file.  More specifically the 'Bytes Sent (sc-bytes)' and 'Bytes Received (cs-bytes)' settings that are not enabled by default. 
If anyone knows where I can locate these setting (outside of the GUI) for all IIS versions that would be greatly appreciated.

Answer 1

I believe I have found a valid solution. You must have the WebAdministration module loaded.  I hope this helps someone.
Use the following syntax to view current W3C fields:
Get-WebConfiguration -filter system.applicationhost/sites/sitedefaults/logfile | select-object -expandProperty logExtFileFlags
Use the following syntax to set W3C fields:
Set-WebConfigurationProperty -Filter System.Applicationhost/Sites/SiteDefaults/logfile -Name LogExtFileFlags -Value "Date,Time,ClientIP,UserName,SiteName,ComputerName,ServerIP,Method,UriStem,UriQuery,HttpStatus,Win32Status,BytesSent,BytesRecv,TimeTaken,ServerPort,UserAgent,Cookie,Referer,ProtocolVersion,Host,HttpSubStatus"}