show existing keyboard-shortcut hints on the task Actions menu

Template/config/show.php

@@ -49,6 +49,13 @@
         <p class="form-help"><?= t('Adds recurrence bookmarks. Also a recurring:XY search keyword -- X = evt/cal/any (native/calendar/both), Y = ori/dup/all (template/duplicate/both). Example: recurring:evtori.') ?></p>
     </fieldset>
 
+    <fieldset>
+        <legend><?= t('Card interaction') ?></legend>
+
+        <?= $this->form->checkbox('organon_tweaks_shortcut_labels', t('Show keyboard shortcuts on the task menu'), 1, isset($values['organon_tweaks_shortcut_labels']) && $values['organon_tweaks_shortcut_labels'] == 1) ?>
+        <p class="form-help"><?= t('Adds the existing key hints (e, s, c, l) next to the task Actions items.') ?></p>
+    </fieldset>
+
     <div class="form-actions">
         <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
     </div>