I would definitely try to make these signals more obvious. One way of doing that would involve using your hands to make gestures that feel right (similar to the facial expressions) to display in the particular situation.

For example, if I think of myself being exasperated at someone either because they're spouting nonsense or being super boring, it feels right to splay the fingers of each hand all the wey out while holding my palms at about a 45 degree angle to my chest.

I want you to stop because you are boring.

A somewhat more obvious one here is bobbing your head side to side in a rhythm -- I find it fairly easy to do this when I no longer have an interest in what someone's saying, and am only hearing the tone of their voice.