Under Catalog > Categories > Display Settings > Display Mode there are three options - products, block, product & block. I propose a fourth option for custom link, so users can link to a CMS Page or external link in the main navigation. There seems to be no easy way to do such a task currently. Creating a block and then setting the category to block only, is not a proper solution and seem more like a hack. There are to issues with this method: 1. You cannot use it to link to external pages 2. Since there does not seem to be a CMS Page Suffix like categories and product pages have, any future change to the menu from a category block to CMS Page would cause a url change and affect SEO. I see no reason why Magento should not support custom links in the navigation. My proposal above is one possible solution to the issue.
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