Limits on post types & custom fields?

I was wondering if it’s possible to consider as a future feature that a setting be included to limit which post types the reviews can be added to, and also if it’s possible to not add the review fields to posts where the review isn’t enabled?

Having so many posts that are specifically set to “No Review” contain those extra custom fields, or having those Review metaboxes appear on custom post types and pages seems to be including unnecessary data on posts that don’t need them.

Thanks!