I bought one a couple of months ago. I think it’s fantastic both for the size and the price. It’s a bit too small of a screen for my aging eyes, but otherwise it works great. I’m keeping it to or when I travel or other good use. Edit: the cameras are… OK. Nothing great, but serviceable. Gcam helps, Google for versions. Also, yes, you can root it. Also GSI flash works, but you lose functions. The battery charges super fast, given it’s size. It accepts like 10w charging current.
I don’t believe it’s possible. I think it’s all the main storage/Downloads, and no other option.
Been wrong before though.