To answer your questions.
1, Its supports diseq but I cannot confirm if it will handle 8 inputs tho.
2, Yes you can activate time shift.
3, Its Android - MX Player works fine but it is built to make the most of Kodi (formally XBMC) so why use an half arsed player when the device is capable of doing so much more.
4, Yes but remember it is a single tuner and doesn't allow for viewing and record via the tuner even if sharing same signal and polarity.
5, Its based on Jellybean not KitKat and it is heavily skinned. Also although it has full access to google play store most apps seem to be incompatible with the device in my experience ie mainly media type ones such as TV catchup apps and ones like Google Play music whilst working are VERY clunky. Can't answer about games as I haven't attempted to install any.
The box is far from perfect but is still pretty good and the best hybrid I've used so far. Just don't expect it to be all singing and dancing because it isn't.