tcowin no, that's not a feature of the extension at this time.
Technically, this extension wouldn't be needed at all, Flarum has a dedicated API just to modify how "slugs" are generated for URLs that's different from the path on which those slugs are used.
Since I received a few requests regarding slugging already I am considering adding custom sluggers into this extension or as part of a companion extension. A companion extension would be better for performance if you don't need the custom paths part.
If you are not going to be using tag slugs, you could manually copy the tag ID into the slug field for each tag and it should achieve the same thing.