Automatically add category tag(s) to questions, or at least suggest them

Question

It seems almost all requests to add tag category/hierarchy/organization/etc have been shot down.

I'm suggesting a different variety: automatically add the appropriate "category" tag(s) when the question is posted.

Here's an example for my personal interest, very similar to a previous answer: On SO there's swing tag, but many people (especially n00bs) use specific tags like jtable, jlabel, etc. without using the swing tag. It would be a huge pain, if not impossible, to add all JComponent subclasses to my interested tags and RSS feed.

Per ThePony's answer, moderators would try to merge/retag, but it obviously hasn't happened (at least not completed) with those JComponent tags.

So instead of imposing it on our dearly-beloved mods, why not let the engine do it automatically, so that whenever a question with only jtable is posted, add swing to it? Or at least it can suggest the category tag(s) to the user.

The tag categorization/hierarchy should be maintained by mods or with high rep users on the category tag (the swing tag in my case).