Although 'Email Address' is already a required field for customers submitting product reviews, there is currently no visibility of this from the Sana admin section. This would be useful for following up on negative reviews to provide a solution, or answer any questions that a potential customer has asked in the reviews section, as often happens.
Also, the capability to respond to reviews once approved would be ideal for showing how any negative reviews are handled, rather than hesitating to show them - see Trustpilot for an example of this.