Application Manager API key/value pairs

Hi Everyone,

I noticed the Application Manager API allows for attributes to be added to a device (key/value pairs) for use with SetDevice / GetDevice.

I am interested to know how these can be added manually via the TTN console, or are they only available via the application Management API? for SetDevice, GetDevice calls?

Can these key/value pairs be accessed also via the Decoder javascript?

Thanks in Adv.