Предложение разработчикам модулей включать параметр выбора layout'а модуля - Модификации расширений для Joomla

<param name="layout" type="modulelayout" module="mod_имя_модуля" label="Layout" description="Select layout" />

<params addpath="/modules/mod_имя_модуля/elements">

<?php

// no direct access
defined('_JEXEC') or die('Restricted access');
jimport('joomla.filesystem.folder');
jimport('joomla.filesystem.file');

class JElementModuleLayout extends JElement
{
	var $_name = 'ModuleLayout';

	function fetchElement($name, $value, &$node, $control_name)
	{
		global $mainframe;
		$db =& JFactory::getDBO();

		// get current template
		$query = 'SELECT template'
						.' FROM #__templates_menu'
						.' WHERE client_id = 0'
						.' AND menuid = 0'
						;
		$db->setQuery( $query );
		$template = $db->loadResult();
		$module = $node->attributes('module');

		// If a template, extension and view are present build the options.
		if ($template && $module) {

			// Build the search paths for layouts.
			$bPath = JPath::clean(JPATH_SITE.DS.'modules'.DS.$module.DS.'tmpl');
			$tPath = JPath::clean(JPATH_SITE.DS.'templates'.DS.$template.DS.'html'.DS.$module);

			// Add the default option.
			$options[]	= JHTML::_('select.option', '', JText::_('Default'));

			// Add the layout options from the first path.
			if (is_dir($bPath) && ($files = JFolder::files($bPath, '^[^_]*\.php$'))) {
				$options[]	= JHTML::_('select.option',  '<OPTGROUP>', JText::_( 'Module' ) );
				foreach ($files as $file) {
					$options[]	= JHTML::_('select.option', JFile::stripExt($file));
				}
				//$options[]	= JHTML::_('select.option',  '</OPTGROUP>' );
			}

			// Add the layout options from the second path.
			if (is_dir($tPath) && ($files = JFolder::files($tPath, '^[^_]*\.php$'))) {
				$options[]	= JHTML::_('select.option',  '<OPTGROUP>', JText::_( 'Template' ) );
				foreach ($files as $file) {
					$options[]	= JHTML::_('select.option', JFile::stripExt($file));
				}
				//$options[]	= JHTML::_('select.option',  '</OPTGROUP>' );
			}
			return JHTML::_('select.genericlist', $options, $control_name.'['.$name.']', null, 'value', 'text', $value);
		}

	}
}

require( JModuleHelper::getLayoutPath('mod_имя_модуля', $params->get('layout', 'default')) );

<?php
 
defined('_JEXEC') or die('Restricted access');

jimport('joomla.filesystem.folder');
jimport('joomla.filesystem.file');
 
class JElementModuleLayout extends JElement
{
	var $_name = 'ModuleLayout';
 
	function fetchElement($name, $value, &$node, $control_name)
	{
		$module = $node->attributes('module');
		$clientId = ($v = $node->attributes('client_id'))? $v : 0;

		global $mainframe;
		$db =& JFactory::getDBO();
 
		$query = 'SELECT template'
			.' FROM #__templates_menu'
			.' WHERE client_id = ' . $clientId
			;

		$db->setQuery( $query );
		$templates = $db->loadResultArray();

		$options = array();
		$options[] = JHTML::_('select.option', '', JText::_('Default'));

		if ($module) {
			$moduleFolder = JPath::clean(JPATH_SITE . DS . 'modules' . DS . $module . DS . 'tmpl');

			if (is_dir($moduleFolder) && ($files = JFolder::files($moduleFolder, '^[^_]*\.php$'))) {
				$options[] = JHTML::_('select.option', '<OPTGROUP>', JText::_('Module'));
				foreach ($files as $file) {
					$options[] = JHTML::_('select.option', JFile::stripExt($file));
				}
				$options[] = JHTML::_('select.option', '</OPTGROUP>');
			}
		}

		if ($templates) {
			foreach ($templates as $template) {
				$templateFolder = JPath::clean(JPATH_SITE . DS . 'templates' . DS . $template . DS . 'html' . DS . $module);

				if (is_dir($templateFolder) && ($files = JFolder::files($templateFolder, '^[^_]*\.php$'))) {
					$options[] = JHTML::_('select.option', '<OPTGROUP>', JText::_('Template'). ' ' . $template);
					foreach ($files as $file) {
						$options[] = JHTML::_('select.option', JFile::stripExt($file));
					}
					$options[] = JHTML::_('select.option', '</OPTGROUP>');
				}
			}
		}
 
		return JHTML::_('select.genericlist', $options, $control_name.'['.$name.']', null, 'value', 'text', $value);
	}
}