Dex Tracker: Ability to exclude certain shinies from shiny Dexes

It would be nice if you could for example filter out not-legally-obtainable shinies (like in the Mega Dex for Z-A with Diancie and co.). And I like to hunt all my shiny Pokemon in one single save, so Zygarde, Mewtwo etc. won't be obtainable in shiny for me