USB device policy

We would like to temporary disable rule "Block writing to removable media" on few computers, but we don't want to create exception in Symantec Endpoint Protection Manager Policies. It is possible to do it from registry ?

On a 64-bit operating system: HKEY_LOCAL_MACHINE\Software\Wow6432Node\Symantec\Symantec Endpoint Protection\AV\Exclusions

We need to do it locally on computer where user have full admin rights only for 30 min an then user will set registry entry as default.

Thanks,

Mario