Index: post-template.php
===================================================================
--- post-template.php	(revision 15380)
+++ post-template.php	(working copy)
@@ -712,7 +712,7 @@
 		'selected' => 0, 'echo' => 1,
 		'name' => 'page_id', 'id' => '',
 		'show_option_none' => '', 'show_option_no_change' => '',
-		'option_none_value' => ''
+		'option_none_value' => '', 'tab_index' => 0
 	);
 
 	$r = wp_parse_args( $args, $defaults );
@@ -721,12 +721,17 @@
 	$pages = get_pages($r);
 	$output = '';
 	$name = esc_attr($name);
+	
+	$tab_index_attribute = '';
+	if ( (int) $tab_index > 0 )
+		$tab_index_attribute = " tabindex=\"$tab_index\"";
+		
 	// Back-compat with old system where both id and name were based on $name argument
 	if ( empty($id) )
 		$id = $name;
 
 	if ( ! empty($pages) ) {
-		$output = "<select name=\"$name\" id=\"$id\">\n";
+		$output = "<select name=\"$name\" id=\"$id\" $tab_index_attribute>\n";
 		if ( $show_option_no_change )
 			$output .= "\t<option value=\"-1\">$show_option_no_change</option>";
 		if ( $show_option_none )
Index: user.php
===================================================================
--- user.php	(revision 15380)
+++ user.php	(working copy)
@@ -590,7 +590,7 @@
 		'include' => '', 'exclude' => '', 'multi' => 0,
 		'show' => 'display_name', 'echo' => 1,
 		'selected' => 0, 'name' => 'user', 'class' => '', 'blog_id' => $GLOBALS['blog_id'],
-		'id' => '',
+		'id' => '', 'tab_index' => 0
 	);
 
 	$defaults['selected'] = is_author() ? get_query_var( 'author' ) : 0;
@@ -621,7 +621,11 @@
 	$query .= " ORDER BY $orderby $order";
 
 	$users = $wpdb->get_results( $query );
-
+	
+	$tab_index_attribute = '';
+	if ( (int) $tab_index > 0 )
+		$tab_index_attribute = " tabindex=\"$tab_index\"";
+		
 	$output = '';
 	if ( !empty($users) ) {
 		$name = esc_attr( $name );
@@ -630,7 +634,7 @@
 		else
 			$id = $id ? " id='" . esc_attr( $id ) . "'" : " id='$name'";
 
-		$output = "<select name='{$name}'{$id} class='$class'>\n";
+		$output = "<select name='{$name}'{$id} class='$class' $tab_index_attribute>\n";
 
 		if ( $show_option_all )
 			$output .= "\t<option value='0'>$show_option_all</option>\n";