Feature Request: RSS Feed Limitation

I added a RSS feed for example. It fed dozens of new threads into the selected forum category. What I need is to limit the amount of threads by each RSS feed in say a 6, 12, or 24 hour time frame. For example, maximum 3 articles in 24 hours.

Here's an example from Vbulletin. You can see how the feed can check every x amount of time and the maximum items to fetch. I need this functionality.