Oh, I see...
Well, when I don't have a clean system for packaging, I make my own working packages (with "1vl70jj" at the end) and set them up on a local repo which I subdivide as follows:
joe1962:$ find . -type d -maxdepth 1 -mindepth 1 | sort
Something like this would take us away from the Slackware repo structure, but also makes classification easier. However, you could only classify packages within a single category, whereas with a slack-categ file, you could do multi-categorization.