Has no one noticed that you can set permissions to the app posts. You can set it to visible to only yourself at the time of installation.
As for just using the social reader as a user — well, I shouldn't have to agree to an app and share my social graph just to read news stories. Friction Sharing is great and working already.
HN discussion: http://hackerne.ws/item?id=3145857
There have been other things, but most of them were fixed rather than being called features.