I would like to be able to speak into my mic, and have that sound pass through the remote pc as if I were speaking into the local mic
We do have an option in the Host client as 'Sound' menu. You can turn that on to pass through the sound to the remote pc. Please read this KB article for more info.
I think Thomas means virtualizing the mic in your local PC and forwarding it to the remote PC, so that — like the remote print feature — the local mic is selectable on the remote PC.
Related to this feature request: https://control.product.connectwise.com/en/communities/1/topics/3380-usb-forwarding
Customer support service by UserEcho