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If you have a need to override or supplement existing flow mappings, you can supply two maps called shibboleth.FlowMap and shibboleth.FlowPatterns to replace, or more likely merge themselves with, the default beans mentioned above. The main use case for this would be to override the flow installed to one of the built-in locations or to register one of the built-in flows at an additional location. The practical reason you would do this would be to add additional endpoints for various services to fit some kind of unusual requirement.
Pre-Supplied
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Beans and
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useful classes
A standard IdP configuration provides you with the basis of building many beans and indeed of composing them. Many of these are informally documented in the appropriate pages. Two important types of beans are Functions and Predicates, which find use in many places. The PredefinedFunctions and PredefinedPredicates topics are a centralised location for this documentation The Predefined Beans topic details them all, as well as providing a list of other "useful class names".