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I don't disagree with any of you remarks & suggestions, except perhaps your initial comment regarding the stats you present:

I would argue that it means that only a fraction of a percentage of users:

1. Are aware that capability exists to turn these thing off, and;
2. Have gone looking for a way to turn them off, and;
3. Have decided to turn them off.

A majority of users do not change options, regardless whether it's in a forum profile or a desktop application (e.g. word processor). That's not a reason IMO to remove options -- though obviously Firefox developers might argue

It might be interesting to look at the percentage of users who have changed their timezone. For those who haven't, I wonder is it because they live in GMT or because they are not aware that the capability to do so exists?

A great many users, especially less seasoned ones, will tend to not use the profile. In it's current state I think it is too wordy, too long, and not focused -- please don't take that as criticism. I'd like to see it restructured so that it displays in a 800x600 window with no scrolling, and presents a series of checkboxes and textfields organized in  categories. Help for each item would be provided separately in a small popup window.

Which leaves the question (your original question!) of which options to include. Perhaps it might be useful to start a list of potentials, organized by category? e.g.,

Identity:
- Real name
- Email
- etc.

Posts:
- Show smilies
- Show images
- etc.

Signatures:
- Show signatures
- Show images in signatures
- etc.

etc.

After removing the Moderator column you may also want to re-adjust the percentage width of the remaining columns, to suit your preference and so that they total 100%.

The "Username" field could be a bit confusing or off-putting for some Guests. Perhaps it could be labelled "Your Name" or simply "Name" for guest posting? In other words, a separate (new) item in the language file and accompanying code to switch between  displaying 'Username' and 'Your Name' (or whatever). Just a thought.

It's designed specifically to give local Internet IT developers a 1/2 hour jump on the rest of North America.

http://www.labradorstraits.net/wiki/RegionalMap

No, I'm not saying those headers are useless. Quite the opposite; they are extremely effective. What I'm saying is that (again, my opinion) browsers should ignore these headers when going Back/Forward. But mainstream browsers IE and Mozilla don't ignore them.

Example:

1. I visit http://punbb.org/forums/index.php
2. I click the link for "Pun discussions" and go to http://punbb.org/forums/viewforum.php?id=40
3. If at this point I click the link "Home" to re-visit http://punbb.org/forums/index.php then yes, the cache headers should cause the page to be re-checked and re-fetched. But if I simply click my Back button, then the page should not be re-fetched -- but it is.

The other four header lines in header.php are quite sufficient to ensure that people are not getting stale pages:

header('Cache-Control: post-check=0, pre-check=0', false);
header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');
header('Expires: Thu, 21 Jul 1977 07:30:00 GMT');
header('Pragma: no-cache');

None of these headers interfere with "normal" navigation using the browsers Back and Forward.

Opera's caching options are different from IE and Mozilla. Instead of "automatic" or "per session" settings, cache settings are based on time (5 minutes, an hour, 5 days, etc.) Alternatively you can opt for "always", which is what I do. This doesn't mean that pages are always re-fetched, it means that pages are always checked for changes. Only if the server reports change is the page re-fetched, otherwise it s loaded from cache.

I have a login on my website with a meta-refresh page and it works fine with Opera set like this. Not with Netscape 4 though, but that's another story, best forgotten

In a nutshell, I think "header('Cache-Control: no-store, no-cache, must-revalidate')" serves no useful purpose (when bundled with the other cache-limiting headers), and in fact hinders browsing for people on low bandwidth / high latency connections.