Description: I think you should add the following entry from PmWiki:UTF-8 to docs/sample-config.php:
I fortunately discovered this setting (by pure chance) just after installing the Wiki, and it saved me a lot of conversion work.
Personally, I think that enabling UTF-8 by default would be a good idea, as we have some special characters in German. There may be reasons not to do so, though. But even if the added line was commented out by default, every new user who copied and edited sample-config.php would at least notice that there is such a setting.