Issue: Show latest threads tagged with X (similar to [showthread])

Showing the latest threads in a forum is very useful when the wiki is about a topic, that has an associated forum.
But if the topic does not have an associated forum, then there is no alternative.

I'd like to request the same functionality as showthreads bbcode, but instead of showing the latest X threads in forum, it would show the latest X threads tagged with Y.
Possibly the bbcode could work like this: [showtags]Vaultwiki[/showtags]
This would show the last X threads from http://www.vaultwiki.org/tags/vaultwiki/

This would allow my wikis to show relevant threads and would thereby be a very useful function for my site.