Thanks for your answer. I hardly understood it (especially the latter part..).
There’s no reason I am not using Custom Taxonomy. Only reason is my lack of knowledge – that’s why I am here.
Once again I am not an expert (but a noob), I don’t know OOP.
So, if Custom Taxonomies is THE SIMPLEST WAY to exclude certain category from breadcrumbs then this is exactly what I want to use!
How can I do this? What’s a Custom Taxonomy? Is it a property of this plugin or is it WP core function? Can you point me in the right direction?