u can subscribe directly to all your rss feeds and we're investing heavily in being a better rss replacement in the next big release!
... If you are indeed changing it to include 100% of the feeds of my choosing, that's great to hear.
What I ALWAYS want + 'a little extra I might like' is something I can appreciate.
If you instead mean the suggestion of additional content into your feed - that's really the core point of Prismatic. I wouldn't expect to see that configurable / given an "off" switch ever. In fact, I'm pretty sure that's how they'll monetize the product - slipping in pay-for-placement content that's relevant to what you're reading.