Please add a checkbox on this page admin/structure/custom_breadcrumbs that temporarily disables all defined breadcrumbs, so to allow better debugging of global settings defined here admin/config/user-interface/custom-breadcrumbs. This way one could determine whether a bunch of similar individual breadcrumbs can be substituted by a better global configuration.

While this module is great and the word 'debugging' might sound a bit devaluating, the plethora of available configuration settings may confuse at first sight and the right setup might not be achieved at first shot. Having such a checkbox would definitely help in optimization.