The Recent Location Pins are very helpful but can lose their purpose when regularly working with several tabs at different locations (HDDs). Increasing the maximum number of pins only works up to a certain point because, when working in one location for a while, recent pins can clutter the tree and not be very recent longer.
A solution would be a "Location Pins Per Tab" setting, with the maximum number of pins applying to each tab. This way, a low number of maximum pins would guarantee that the marked pins truly are recent/fresh for every working set (tab).