Hi rmiddle, when you invoke the keyboard, there is a menu on top with cntr and alt, Does that help with what you are trying to do?
I assume you are talking about the Function key Section. If so no. As they are like Shift Key. They are waiting for a 3rd key to get hit in order to send all 3 keys. Well the windows client for VMware require you you to actually send the keys ctrl-alt to unlock the screen.