so when tags are disabled showing the list of videos in a category should use much, much queries?
The list of videos in a category is pretty much static untill a new video is added to that category. So why not cache the page? Pulling the data from the database each and everytime someone browse through the videos seems overkill to me.
Perhaps you can contact a developer like
thegeek. With his GARS mod, you get to see an icon, description and keywords in the listing of articles (pretty much the same idea as your great mod, but with articles instead of videos), and with his listing just about 9 queries are run (and that's when over 20 articles/icons/descriptions/keywords/authors are shown).