Page parent and sibling edit permissions?

We previously discussed (Rename page and URL not available to full-permissions user ) giving full-permission non-admin users the ability to rename and change URL of pages, as it doesn't expand their powers beyond Create and Delete.

Now that we're starting to produce wiki content in earnest, we now see a significant pain point around refining a page's parent-child and sibling relationships to other pages.

To that end, we need to grant permissions for non-admin user to rearrange pages (using the site map page, for example.)

The same argument seems to apply: This is no more power than Create+Delete, which these users have.

I don't have a strong feeling whether "Change Site Map" permission should just be attached to Create + Delete permission checkboxes, or whether it should require an additional separate checkbox.

Thanks!

- Graham