Hi TJPaul,
What is your setting in the C4D-Preferences> Input Devices> Control-Click for Right-Click?
I have it set to on, and I use the Apple (Command) key for this.
Let me know if that works for you.
As a side note, I have done some presentations in my life, and typically I ask to have the presentation computer a Mac and in its default setting. During one Siggraph presentation, this was not the case. Everyone who does a presentation live knows that it is not the same as sitting at home and have all the attention on the problem. Long story short, make sure that the default settings are given on your Mac. Mac-Preferences>Keyboard>Modifier Keys.
My best wishes