From our end there is no information in regard to that matter. My recommendation would be to use the Local Group Policy Editor, like you mentioned on the previous post and configure each feature depending on the outcome you would like to get but unfortunately we don't have any information available to configure the Intel® HD Graphics through registry keys.
the options are stored in the registry
the values are stored in HKEY_LOCAL_MACHINE\SOFTWARE\Intel\Display\igfxcui
however if a profile has being created the value that have changed from the default are stored in HKEY_LOCAL_MACHINE\SOFTWARE\Intel\Display\igfxcui\profiles\app\PROFILE_NAME causing that profile to be applied to all users
the per user settings are stored in HKEY_CURRENT_USER\SOFTWARE\Intel\Display\igfxcui
Thanks Zeqzy, that will give me something to go on. Will mark as the answer after testing.