Seeing that tags can now be customized to be unique (background and color) I think this a logical expand of their function.
The idea is to choose from ACP tags and link them to categories.
I give an example :
This could be tags linked to this category, showing them on top of the topic list could be used as filters to only see a certain type of post represented by the tag.
I think the best option would be to allow from ACP to choose for a category the representative tags and why not to create one if not existing.
We could imagine that then the composer have a special input with tags linked to this category and a dropdown to choose from the actual tags.
I think this could be a very nice feature to add some organization and it could respond to a lot of use cases.
What do you think about it ?
I'll open an issue linked to this topic.