New categories for polls (voting) are unneeded.
Polls are already implemented as a special feature of a post (not of a topic, nor of a category.)
Any member with the proper privileges can create a poll in their post(s).
Poll building is under the gear 
icon in the post editor toolbar.
Here is an example …
Do you understand this forum’s poll building feature ?
- Yes
- No
Here is another topic, in this very category … that has several polling questions in the thread opening post …
Again, this forum is already for discussion and topics can be created by anyone in the feature requests category to discuss any proposed improvements and request any features you might desire.
Simple voting of Like / Dislike for proposed features does not give the SketchUp development staff good information, as that is just subjective emotional opinion. (When Google still owned SketchUp, the staff used a special Google website that solicited these kind of emotional feature requests and Like/dislike voting, but it was really worthless, and eventually Google shut the entire site down.)
Polling questions need to be carefully written to extract the most objective data on possible usage by the users answering the question(s). Data such as how often will the feature be used ? How much time will it save ? etc.
By policy, because of the competitive nature of the software industry, Trimble SketchUp division does not publicly announce future features, before they are released. SketchUp staff have said this many times over the years in all of the SketchUp forums that have ever existed.