The stock remote that came with your SkystreamX should turn the unit on and off.
Any other remotes or USB Keyboards may or may not turn the unit on and off. We cannot control third party remote controls or modify anything to make them turn the unit on and off.
You can leave your unit on all of the time. The Android operating system was designed to be left on all of the time just like a cell phone or tablet. So if a remote control that you purchased is not turning the unit on and off you can simply leave the unit on.