Sonos devices 

No.  Sonos devices are meant to be kept on.  They enter a low power mode shortly after they stop playing audio.

No, the app has no Bluetooth capabilities.  You connect to Bluetooth using the Bluetooth features of your device.

Can this be upgraded?

I would love to control my device switching from wifi to Bluetooth and back whenever I want to. 

Where can I leave a feedback about the app?

Thanks

Are you talking about Roam? It’s accessible via WiFi or Bluetooth at any time. Just connect the phone accordingly. 

Hi Ratty

Am talking about Move

Each time my Sonos Move is on bluetooth,  I Would love to switch it from bluetooth to WIFI connectivity through the app but unfortunately I can't unless I go to the device and change it manually. 

Can the sonos app be upgraded to allow people change from bluetooth to WIFI connectivity using the app?

Not sure what you are looking for.  You can switch from Bluetooth and back.

Move, at least at present, can only be on WiFi or Bluetooth. Since the Sonos app is only operational over the network I don’t see how you’d get the Move back again if it was remotely switched to Bluetooth.