hi @rmurnane thank you for your post here on the Zoom Community! You are correct that it is only possible to allow or disallow all participants to annotate, we don't have a way to only allow certain individuals to annotate. There is an Annotation Setting where you can "Show/Hide Names of Annotators" and if this is enabled and people see their names come up on screen, or you as the teacher see that, it helps to be able to call them out and correct the behavior. You may have seen this support article that mentions how to enable this
https://support.zoom.us/hc/en-us/articles/115005706806
But your question is actually a great suggestion and I think it would be great if you could enter this as a feature request! Currently, our product team reviews all feature requests submitted via our feedback form https://zoom.us/feed. I highly encourage you to submit this feature and explain how it would help you in your day to day use of Zoom!
If this has answered your question to your satisfaction, please click the "Accept as Solution" button below but if not please reply and we can continue the discussion. Thank you!