Thank you for your question @NWCartographic !
This is exactly why our standardized taxonomy is an open-source repository! Merchants are encouraged to request additions of missing categories directly on GitHub. Please submit your request here using this link. We have a dedicated team that reviews all submissions and incorporates them into the next version update of our taxonomy.
If you do not have access to submitting issues on GitHub, anyone can submit the request on your behalf. If you share more information, I can do it for you, or you can submit a ticket with our Support team.