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!
I think could result in a bettere user experience to place the PowerPoint presentation loading bar in the main confernece Windows, where at this moment you see only a generic "Loading in progress", without a bar or percentage.
You can see a bar only is you "hover" on the monitor icon, but this is not very intuitive.