This is available from Install the Server. It adds support for:
To take advantage of these features requires the wikipublisher library version 2.2.01 for PmWiki 2.1.27 and above, including PmWiki 2.2beta65. This also includes a number of fixes to comply with PmWiki 2.2.
Sites that have customised the Site.*Template pages will need to revert to the default settings to take advantage of the new div and hr features.