What is the site policy on question titles that are not in the form of a question?
I don't think that the title has to be a question, if that's what's being asked.
I agree with Sandy in that each question should be literally a question. Obviously discussion will provide a few avenues for clarification, but that's not what we're discussing.
However, on Meta I don't know that we need as strict a rule. I think it's fair that there may be some meta questions that won't be literal questions. I'm not sure right now what that may be, but we do have "discussion" tags as a default for a reason.