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Customizations are used for many things; here are some gleaned from some actual use cases:

• Getters which return Java collection objects instead of declared type (e.g. type = FsList, object returned is an ArrayList<FeatureStructure> or a Set<FeatureStructure>)
• Additional "setter" forms.  example: a setter for a float feature, taking a "Float" argument, and handling various NaN style including mapping "null" to one of them, then calling the underlying setter
• Additional methods that operate on multiple fields at once (perhaps keeping them in "sync")
• Override clone to do a deeper copy
• modify a getter - if null is the value, substitute a custom alternative
• Additional arbitrary methods that produce values via operations on features
• Additional constructors, taking more arguments, setting fields
• Additional fields (not in the type system, not serializable, etc.)
• custom tostring methods
• defining a custom compareTo method

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