Custom fields for pages is in our plans but we have not decided on the exact timing of delivery yet and will base it on feedback from the community.
To that end I entered the feature in our Issue Tracking system. Using this link
you can vote for the implementation and track its status.
Thanks for raising this request for consideration. It might be considered beneficial by many clients.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items