It doesn't look like Jive has responded to your request to add to the View Feeds page a category RSS feed. We are trying to do the same at our end and I'm wondering if you have been able to come up with a workaround.
RSS is definitely views as a "workaround" at our company. If people want a "notification" on something they want that to be in email. They may have content they are watching in a stream in Jive and other content they want to get email on. Anyway, I just wanted to note that our community really wants the same sort of segmentation that you are asking for on categories and tags, but for email notifications. RSS would be a fall back if email couldn't happen but it's viewed as another thing people have to check.