chad@notsexy /a/vag/mediawiki (master)$ git diff
diff --git a/includes/installer/WebInstallerPage.php b/includes/installer/WebInstallerPage.php
index 0fcda7d..17a77fa 100644
--- a/includes/installer/WebInstallerPage.php
+++ b/includes/installer/WebInstallerPage.php
@@ -1079,10 +1079,13 @@ class WebInstallerOptions extends WebInstallerPage {
                if ( $extensions ) {
                        $extHtml = $this->getFieldSetStart( 'config-extensions' );
 
+                       $goAheadAndEnable = array( 'Poem' );
+
                        foreach ( $extensions as $ext ) {
                                $extHtml .= $this->parent->getCheckBox( array(
                                        'var' => "ext-$ext",
                                        'rawtext' => $ext,
+                                       'value' => (int)in_array( $ext, $goAheadAndEnable ),
                                ) );
                        }