In my RSS feed, I want to append to the end of each post title the number of comments on that post if there are any, ie:
Post Title 1 (1)
Post Title 2
Post Title 3 (4)
I've done this in the past by modifying the theme, and then using MagpieRSS on another site to aggregate everything. However, the main RSS feed isn't updated unless a new post is made; creating a new comment doesn't update the timestamp of the posts' feed, and so Magpie doesn't update it.
Is there a way to, when the comments rss is updated, to update the timestamp of the main rss feed? Or even better, a plugin or something that would do what I want to do with the feeds?