XF 2.2 Is it possible to create a node that only allows polls?


I created a "General Discussion" type forum where I want members to only be able to post polls, however when I select "Forum" as the node type, and the type as "General Discussion" and then choose the node settings the "General Discussion" thread is grayed out and I don't have the option to only allow polls:


When members post polls the default tab that is highlighted is "General Discussion" like this:


I want that Poll option to be highlighted by default, but only in certain forums, or in forums that allow polls, so what template should I edit, and what syntax should I use?
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