@v4 I think there´s already a plugin that lets you do that, show the N last posts from a category in the home page. Since you only have one category, i think that meets your requirement. Check the plugins category in this forum, i think you'll find it there.
Tags - Are they timestamped?
Have a quick question. Do tags have a timestamp on them in the backend?
One of my new feature requirements is spotting trending tags and some sort of re-organisation of the tagging system to perhaps give people an alternative way to navigate the forum.