Can we sideload on BB10?

If so, I have a few questions:

- Can you sideload Google Play (Android Market) to browse and download apps?
- Do Android Apps work with BIS and push notifications or will your battery life be drained?
- Can Android Apps access the camera and other features such as the microphone for apps such as SoundHound ?
- If one is unhappy with BB10 apps, can they just rely on Android Apps to get them through? i.e. Android Google Maps, Android Facebook Messenger, etc