expandable and collapsible feature request – and THANKS for the awesome plug-in!

This is an awesome plugin! I’ve been experimenting with it and have it working here:

https://scrapgirls.com/blog/digital-scrapbooking-tutorials-index/

However, because some of our categories have such a large amount of posts I’d really like to be able to have a little triangle next to each category (and sub-category if we add them) to expand and collapse the display of the posts listed below them.

Would that possibly be something you could add? Please?

https://www.ads-software.com/plugins/post-category-index-generator/