Bug: Can't add custom WMI monitor if the name begins with % character

Bug: Can't add custom WMI monitor if the name begins with % character

Hi i've noticed while trying to add a custom WMI monitor that begins with % it doesnt work.
After clicking ok the page briefly displays "Error" and then goes back to the server, no monitor added.
 
Some examples of counters ive tried to add:
 
Processor\%Processor Time
Memory\% Committed Bytes In Use
PhysicalDisk\% DiskTime
 
Is there a work around for this?
 
Regards
Jared

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