This functionality already exists to put content on more than one specific page, what Joe is asking for is one click to put them on ALL pages.
Note that publishing on multiple pages is only supported by some features like html Content, Google Maps, Contact Form, but not Blog, Forum, WebStore and other more complex features.
To publish on more than one page go to Administration > Content Manager
From there you can either find existing content or create new content, then click the Publish/Delete link to see where you can publish it on any pages.
Hope it helps,