The traditional ones added via the boardpicker Overlays button.Which overlays? The ones in the extension, or the ones built in to VASL?
Not the draggable overlays added via (1) the Overlays Extension and (2) the Draggable Overlays buttons - Orchard buttons on the toolbar. For the purposes of this discussion, overlays from these sources are counters (because of the way they are implemented in VASL).