Please remember to run it form the TV Store e.g. from the Develop category (see https://dev.opera.com/tv/testing-your-app-inside-opera-tv-store/). Only then the uid will be passed. It won't work if you will just type application url in the TV Emulator url field for example.

The application user interface can be done in 720 only but it should be possible to play video inside such apps in higher resolutions. It may seem wired, this is due to how applications and video is rendered.

Yes, Opera TV Store is at Tivo as well.

Use Ads, Payments etc..

You can find it at Sony, Tivo, Samsung (Blue-ray Disc Player) etc.