This is a good point.
Unfortunately, the "disable sounds" setting is per-user (not per machine), stored in the HKEY_CURRENT_USER registry key.
Hence, it doesn't get currently propagated by the installation package (or ADNM policy).
I'll have this issue filed - it's a good suggestion for the next release.
Meanwhile, you can use the attached reg file (renamed to txt) to set this (e.g. from a log on script).
Thanks
vlk