Cisco Proximity does not support sending audio. Also the framerate is too low to transmit video in a good way. Typically 1-3 fps.  Cisco Proximity is more tuned to support sharing powerpoint/pdf presentations that are more static in nature.

Proximity for Mac (and Windows) only support share content. There are currently no plans for adding call control.

TC is not supported by the proximity apps. It did work at some point in time (2-3 years ago). Since moving to CE software only the CE software is tested and supported. Hence, TC might have stopped working at some point in time. Most likely this is a...

There is one shortcut on both Windows and Mac. Alt + f12 will start or stop the presentation.