I want to make an optional "exclusion list" for a campaign. Basically it is just a list of models that exist in the campaign, and to screen out everything on the exclusion list.
Want to play heart but to exclude the hounds? Stick em on the list. Don't want people to be able to play with ultimate abilities? Take em off the list. No Gnolls? Sure, you do you buddy... sick puppy.
This does not make a lot of sense for single scenario games. But say for example you want to run a game that is mashing disparate content together. Or you have a complete rework of a class/motivation/ancestry and you want to hide the old one. Or an ability. Or perhaps there are too many skills and domains and you want to limit them on the character sheet.
Something like this would be handy.
Not needed for Alpha, but very handy by end product.