Make it possible to suppress a warning posted by the aqPerformance.Start() method‏

Dear colleagues,

I would like to ask you to add an additional optional parameter to the aqPerformance.Start() method to suppress the warning posted to the test log if the specified time counter is already running.
aqPerformance object is a handy one to implement timeout support in the custom methods, but automatically posted warnings result in the false negatives which I would like to avoid (without workarounds with event handlers:) ).

Thanks,
/Alex
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