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Because it would require to share data between PHP processes, which is an expansive task for PHP at a large level.

Besides, most databases will cache very accessed data, like the session table.
In PostgreSQL, if you have enough space in shared memory, the whole table will probably be cached.

This ...

It won't be in viewtopic.html - you have to go to the style editor and tweak the CSS. I haven't done it myself, so I don't know where to tweak. Just look through the CSS and see what makes sense.

There are only four hook locations. It's not as fancy as you think.

A decent operating system should cache frequently accessed files in memory.

phpBB's caching system does not cache the whole page, so it should have nothing to do with IE's caching system. And phpBB doesn't handle images, the webserver does.

http://www.phpbb.com/community/search.php

Try it. See what happens.

LDAP has nothing to do with MySQL.

I have never seen a WYSIWYG post editor that I can tolerate using. I wouldn't mind letting it handle things like bold and italics, but list editors and more complex stuff never seem to work as I intend in WYSIWYG editors.

There's a maximum size limit on the size BBCode.

Presumably so they can customize it as they please.

The PHP session system stores sessions in files on the local server, meaning it won't work across multiple-server setups for large forums.