First of all: Thanks for this application, I love it! I was hugely disappointed when Google replaced the native Youtube app with this HTML5 launcher. With SmartTubeNext you made the Youtube Experience on my TV fun again!
I have one wish though: The Youtube website offers you the "Don't recommend channel" option to clean your recommendation stream of channels you are not interested in:

It would be really great, if you would make this option also available on the app. Currently I am using YT 90% of the time on the TV. And if YT recommendeds you channels, you not only need to change to to computer to block them, but also wait and hope for them to show up at the recommendation feed again, since Youtube otherwise does not offer any other way to blacklist channels.