I wonder if there is (or is planned to be in the future versions) a command line option for callback connection where Host (or Agent) would call the viewer IP and port.
I was also looking for this feature. <censored> has the <censored> product which is just what I am looking for, but the refresh speed is currently horrible.
Regarding callback, we are going to handle this differently. Instead of implementing manual mode we'll see if we can make it fully automatic, i.e. automatically determine if callback is possible.