Adding to Viking's note below:
Launch Pages, then send your request directly to Apple, using the Provide pages Feedback menu item in the Pages menu:
Use the feature request form to ask for this feature and describe how it would be beneficial to Pages users.
You are unlikely to get a direct reply unless Apple needs more details, but your message will get to Apple, and, if you've made a good case, be forwarded directly to the Pages development team.
As this would be an 'unsolicited idea submission,' 'd also suggest reading Apple's policy statement regarding these: Apple › ca › legal › intellectual-property › policies › ideas.html
Legal - Unsolicited Idea Submission Policy - Apple
Regards,
Barry