As discussed in the thread http://moodle.org/mod/forum/discuss.php?d=30628 (and others) the limitation to 10 answers in a question is problematic for some users. I modified the match questiontype to (a) display all defined answers (e.g. from an import with more than 10 answers) and (b) to always display one additional empty answer field.

mod/quiz/questiontypes/match/editquestion.php

@@ -7,18 +7,22 @@
         }
     }
     if (empty($subquestions) and empty($subanswers)) {
-        for ($i=0 ; $i < QUIZ_MAX_NUMBER_ANSWERS ; $i++) {
+        $subquestions = array();
+        $subanswers   = array();
+        if (!empty($oldsubquestions)) {
+            foreach ($oldsubquestions as $oldsubquestion) {
+                $subquestions[] = $oldsubquestion->questiontext;   // insert questions into slots
+                $subanswers[] = $oldsubquestion->answertext;       // insert answers into slots
+            }
+        }
+
+        $i = count($subquestions);
+        $limit = QUIZ_MAX_NUMBER_ANSWERS;
+        $limit = $limit < $i ? $i+1 : $limit;
+        for (; $i < $limit; $i++) {
             $subquestions[] = "";   // Make question slots, default as blank
             $subanswers[] = "";     // Make answer slots, default as blank
         }
-        if (!empty($oldsubquestions)) {
-            $i=0;
-            foreach ($oldsubquestions as $oldsubquestion) {
-                $subquestions[$i] = $oldsubquestion->questiontext;   // insert questions into slots
-                $subanswers[$i] = $oldsubquestion->answertext;       // insert answers into slots
-                $i++;
-            }
-        }
     }
     print_heading_with_help(get_string("editingmatch", "quiz"), "match", "quiz");
     require("$CFG->dirroot/mod/quiz/questiontypes/match/match.html");

mod/quiz/questiontypes/match/match.html

@@ -76,7 +76,7 @@
     </td>
 </tr>
 <?php
-    for ($i=1; $i<=QUIZ_MAX_NUMBER_ANSWERS; $i++) {
+    for ($i=1; $i <= count($subquestions); $i++) {
 ?>
 <tr valign="top">
     <td align="right"><b><?php  echo get_string("question", "quiz")." $i";  ?> :</b></td>