Default we use taxonomy/term/[tid] as the term path.

If you have a content type "Book", you want to change the page to "books/category/[tid]", you could do it in this way.
1,Navigate to rules management page. You will see "breadcrumb for node view" rule, clone it.
2,Add an condtition "node type is ", choose "Book".
3,then edit action "breadcrumb2_append_breadcrumb_trail" in the loop, on action edit page, Change URL from "taxonomy/term/[parent-term:tid]" to "books/category/[parent-term:tid]".
4,save it.

The directly purpose that I create breadcrumb2 module is that I want to change the path of term in breadcrumb. By using custom breadcrumb2 module, it is very difficult to do this.Then I build breadcrumb2 to make it easy.