Dokuwiki has a directive which specifies the Start page name. On the dokuwiki side, the default in "dokuwiki.php" is

$conf['start'] = 'start'; //name of start page

This can be overridden in the Dokuwiki configuration plugin, or else in file local.php in the dokuwiki/conf directory.

In Mantis the default root namespace is specified in config_defaults_inc.php with global variable

$g_wiki_root_namespace = 'mantis';

However, the default starting page hard-coded in wiki_docuwiki_api.php is

$t_home = 'start';

Variable $t_home should be set to whatever is in the dokuwiki configuration. If Mantis cannot retrieve it easily, then we need a new global variable

$g_wiki_start_page = 'start';

for us to override.