Hi Alex,
For Categories, the URL Keywords field can be used to dynamically add keywords in the URL of the Product Listing page but currently to the ability to assign title and description tags to your Categories is not currently supported. I will add this new feature to our Enhancement Requests forum as well as our the Smith Cart dev roadmap. If you need this change completed right away and would like to sponsor a portion of the development please submit your quote request here:
https://www.smith-consulting.com/Serv...
Thanks,