We acquired the K2 content plugin for JomSEF 4 / Joomla 2.5.

When the plugin generates the URL, it removes a paramenter we need to keep.

What we need:
index.php?option=com_k2&id=5&task=category&layout=category&view=itemlist&Itemid=388

What is happening:
index.php?option=com_k2&id=5&task=category&view=itemlist&Itemid=388

The extension is removing the layout=category parameter.

How can we tell JomSEF to not remove this paramenter?