Right now the URL column type just takes text URLs. But when making a Link in a page or canvas you get a UI that lets you choose pages in the current document as well as type a URL.
It would be great if there were a Link type for columns (or just an upgrade to the URL type) that would behave the way links do on pages, with the same UI for picking pages within the document.
It would be especially great if Coda displayed the page’s icon instead of the generic globe when the link is to an internal page.