Hey there,
As always, loving your work 
I did have a request made to me that I looked for but I don't think it's a current option. What they would like is to be able to set a default category view by user group. So even if they do have access to a busy category, by default it doesn't get seen.
I know I can go into each user and set it for them, but if it's a good idea for everyone, I thought I would mention it here
Hope you are having a great week!
David