Adding attribute for Improved Navigation Module.

[janers2015]

Hi i am currently working with this Improved Navigation Module and i want to add an another attribute for a second cms block in this module. This function I already created this in the Manage Category.
https://community.magento.com/t5/Programming-Questions/Creating-new-field-in-Catalog-gt-Manage-Categ...

But the problem is in the addAttribute firts parameter is for the entity type of  "catalog_category", how can I make it that it would belong to the Improved Navigation Module.