I just came up with a "feature request", but then spent ten minutes finding out what to do with it, because I was thinking of a statement "we should do X", not a question "should we do X?", and this site is for questions not statements.
I found the [feature-request] tag, and sure-enough several of the "questions" there are formulated as suggestions and not questions. So it seems that many people including myself think of feature requests as suggestions and not questions.
My explicit question is: "Do feature requests have to be formulated as questions?"