It's possible there's a better way to handle this content, but here's what I'm trying to do:
I have a listings site with a huge amount of terms for a custom taxonomy--around 450. It will be incredibly difficult to wade through all those terms when adding new posts. I need a way to list the taxonomy terms in a way that is easier to scroll through.
I'd like to make the categories into accordion-style dropdowns, where every parent term is turned into an accordion/link, so that at first, only the parent terms are listed.
Then, when you click a parent term, all the child terms open.
I am not sure if this is possible (without a ton of work) or if there are better alternatives. So far, I haven't found much for altering the taxonomy meta box beyond changing the select type to radio/dropdown, etc.