Auto assign owner for workstation

Auto assign owner for workstation

If the option "Auto assign owner for workstation (This is applicable only for Windows OS):" is set to "Assign the user who has logged in recently  " is there any way to make an exception for machines that are "shared"? While for ~95% of our machines this would result in correct assignment, we have a handfull of machines that have many users that could log in, and i can't see a way to make that exception. 

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