So I have read articles on Managed Metadata, Content Type Publishing and Editing Document Library templates and while related none of these seem to do what I want to do. I want to add the "Link to Document" content type to all existing document libraries in a site collection. At that point I can edit the document library template so that I never have to do it again. Is this possible? If there isn't a built in way to do it is there a way to do it in powershell?
You can do it with PowerShell. A simple bing search returned this.... http://thesharepointproject.com/2012/05/18/adding-content-types-using-powershell-content-types-part-1/