normally, in main tab, when i push backfill all... is backfilled all symbols (index and listed in WL)
(I have WEBULL)... now, I have DIA, SPY, IWM USO and GLD as index and these symbol take too much time until the end of BF (other my index listed are $IXIC, $XDE, and $VIX and haven't this problem.) and my about 20-30-40 stock symbols listed in wl are reasonable fast for this work.
an option to BF (button) exclusively for index and another BF button for symbols listed in WL for me is a good way to fix this problem.