Changing r.TemporalAASamples at run time?

Dose changing r.TemporalAASamples at runtime via concole command accualy work? Im getting mixed resaults.

Is any one familiar with its exact working when you reduce r.TemporalAASamples? If I understand correctly it should drop older frames buffered for TAA?

Im trying to make Temporal AA use as many frames as posible from certain point in time and ignore older ones.