Multiple Feeds Question

I have a much longer pre-installation question, but I'll save that for another post. :)

Here is an easy one, I hope.

I see how I can set up different RSS feeds for different categories. I also see where I can set the default number of items to appear in RSS feeds. Is there a way to have different numbers of items in different feeds? E.g. show 10 items in feed1 but 30 in feed2?

Thanks!