I have also commented on this here:
NodeBB/nodebb-theme-lavender#31psychobunny created this issue in NodeBB/nodebb-theme-lavender closed Category view improvements #31
The Recent Cards plugin has the option to only show posts from a certain category. It'd be nice to be able to exclude a category as an alternative.
I would also be interested in being able to exclude a category from the new messages notifications. Our community host a "classified ad" section. It is nice but generate a lot of noise that many users would like to be able to ignore easily.
This would be very useful for us too... We have "Testing Ground" sub-category... I would like to exclude that from Recent Cards...