First, thanks for creating WP SC. It found it to be very efficient. Great job!
I would really like to cache files like the homepage, categories, feeds etc. However, I don't want to cache them using the same expiration date than posts/pages because they tend to be very dynamic.
It seems that having a different expire time for those would work well. Having posts preloaded until they are modified, and home+cat+tags... cached for only a few minutes would still help a busy site tremendously.
I'm saying that because I thought that the homepage would be cached until there's a new post, but that's not the case (let me know if WPSC does detect this - because my homepage is not getting updated in the cache)