Create a .nxs file with your settings, protect the .nxs file so that it cannot modified by the user (using chown/chmod or putting it on a read-only file system), create a link on the client’s desktop. That’s it.
As I tried to explain, the microphone is handled in a special way. This is intended to protect the user.
We had a quick meeting and we decided to modify the key as:
<option key=”Audio is muted” value=”default” />
In this way the default behavior is preserved but if you change it in the .nxs to true or false it will retain the requested setting. This change should be available in the update published tomorrow.