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I personally much prefer title case, since a heading is, after all, a title.
I keep meaning to finish the style guide, but other things keep come up. Including being invited to write for a professional style guide, for which my FRW style guide turned out to be a good example of my work. :)
Actually, it would help if you all make suggestions, raise concerns, or flag issues with me now, rather than after the MoS is done. That way we can settle things prior to writing, I get more ideas on what to write about, and I get more of a push to finish it. :)
It sounds like 3 of us like title case, and 1 of us likes sentence case. Also, I'll note that whoever originally made the suggested headings listed on the Template doc. pages used title case, so that was the "policy" that I "believed" when I first joined. I've been meaning to give more feedback on the MoS in progress, but I've been falling behind recently....
−20° F) or should I put in the actual font characters, like so: −20° F. Two pages where you can see these in use are cold snap and aura of comfort. Using entities is arguably more portable, but once you input the characters from wherever you can find them (hopefully the "more" menu in the oasis skin or at the bottom of the edit window in monobook), you can cut and paste them where they need to go and editing becomes more WYSIWYG. Does anyone use the visual editor? How would you enter this quantity using the visual editor?
How do we want to handle special symbols like this, and do we care enough to run a bot over all the pages to convert from one style to the other?
Vaguely related links: Forum:Consensus on minus signs, Forgotten Realms Wiki:Minus signs
As to HTML entities vs special characters for us advanced users... I can see the benefits and flaws of both styles. The HTML entities (which I didn't know how to do until today) can be very obscure if you don't know what they are or represent, especially things like "amp" and "nbsp", but "minus" is fairly clear. But they're hard to input. Wikia won't even show them in MediaWiki:Edittools; they'll display on that link itself but not while editing, so there's a super-secret non-breaking space there you can't see but can input invisibly. So the HTML entities need to be typed out fresh each time.
Meanwhile, special characters can be clearer, ° vs "deg" for example, and are easier to input from a character map or edit tools. On the other hand, hyphen, en dash, em dash, and minus all look the same in the source editor.
I don't know. On a character by character basis, both styles have their pros and cons, but they're not even consistently the same pros and cons. Mostly, these are a thing for advanced editors who can do them, according to their skills. For me, with the source editor and character map, special characters are easier. So, I don't think it matters which we use. I can address both forms in the MoS, and let individuals choose which they prefer.
I'm the opposite when it comes to typing in non-keyboard characters. I don't like removing my fingers from the keyboard to touch the mouse or the trackpad on my laptop. I can type the HTML entities just as fast as typing a word with nary a blip in my concentration. We only use a handful of special characters, so once you learn a few they are quite handy, IMO.
The exception is where we have adopted an unwritten standard, the standard is not largely consequential, and it would be much harder to shift all existing articles to a new standard than simply officially adopt the existing one officially.
Given that title versus sentence is really a visual preference, Wikipedia already uses sentence case, and, largely, we are using sentence case already, I would discourage a change to title case.
That said, time is precious and the wiki is spotty in places and lacking in many others, so if it's a choice between someone spending a day adding and fixing contributions that readers will value, versus changing a bunch of capitalisation, I think the choice is clear!