Firstly let me say a big Thank You for the app it's one of two I constantly switch between. What would stop me switching would be if the option to block users and communities was added.
Just something I use a lot while filtering the all feed to hide stuff I have no interest in so I can find what I want to sub to easier.
Seems easy enough. I'll add it for the next release. One caveat is I will not be supporting offline mode for this (yet) as that would be pretty involved.