How to use a SharePoint Wiki

It is only possible to have one Content Type for Wiki pages. It is SharePoint Wiki design that doesn’t allow this. ( a bit strange in my opinion)

We want to have some template pages for some categories. Like a server, application and customer template.
What I’ve done now is added a dropdown box column with: Type Wiki page and added the categories there. Added some pages and make a selection on the Type Wiki Pages.

 This is a good workaround because it is standard SharePoint functionality.