Currently, the fit to window only zooms OUT. So if the user sharing has a larger desktop, the setting shrinks the shared content to fit your screen. Fit to window should also zoom IN, so the picture grows to be legible when the shared desktop area is small, say a laptop or tablet.
Nothing worse than sending a IM at the wrong time when someone has their desktop shared.
It would be great if the status graphic could go a special color like blue or something.
In Lync / Skype meetings it should be possible to transmit a clearly visible mouse pointer, marked with the name of the participant pointing at a specific point during a desktop sharing session. Currently only the presenter's pointer is visible. This is a common feature in products like Teamviewer and should be available in S4B desktop sharing too!