Comments on pages vs. blogs (configurable permissions)

I want to allow users the ability to comment on Blogs and possibly some pages – but definitely not all pages. Blog comments and no page comments would be fine as a quick fix so long as it was configurable at the space and not global level.

So far, I can't find any way to make Confluence distinguish between the two. Either a user has permission to comment or they don't. The trouble is, I don't want silly comments littering up places of my site where they add no value. I had hoped that simply locking the page would be enough to prevent a user from commenting, but the lock doesn't appear to apply to comments. As such, I've had to disable the commenting permission entirely in order to prevent babble, and that reduces the value of the Blog feature.

Am I missing a configuration option somewhere? If not, I hope this distinction can be added to a release in the very near future. Thank you.