Hi Lachlan,
Those settings were not in Web.config because its not implemented well and having these settings available makes it possible for a user to break the site if they add some malformed additional meta data and the only way to fix it is directly in the db. So I'm trying to avoid support for settings that non tech folks should not mess with and even tech folks can get into trouble with.
Your ability to find them proves you are worthy to change them :-)
At your request I'm adding it to Web.config with a strong warning against changing them:
<!--
Setting these to true will make it possible to edit additional meta and pageencoding.
WARNING
I recommend you leave this hidden and do not change these settings.
If a user enters something wrong in these settings it can
break the site and the only way to fix it will be removing the bad data directly from the db.
Also I don't recommend changing the page encoding from what have as the default.
If you do change it then you may experience skinning problems or
javascript problems or captchas not working.
-->
<add key="ShowAdditionalMeta" value="false" />
<add key="ShowPageEncoding" value="false" />
Maybe someday we can implement it better with some kind of validation.
Best,
Joe