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Changing auto add behavior
When AqlaSerializer meets unknown type it tries to recognize it automatically the same way as RuntimeTypeMode.Add(type, true) does.
By default subtypes are automatically registered to their base types as with ProtoInclude attribute (if they were not registered before). All member types are automatically registered too.
You can get or set the current IAutoAddStrategy with RuntimeTypeModel.AutoAddStrategy. The default strategy can be casted to AutoAddStrategy so you can alter its settings. To avoid unpredictable side effects please don't try hot-swapping AutoAddStrategy or changing its settings between adding related (via inheritance or composition) types.
One of important settings is AutoAddStrategy.ImplicitFallbackMode property which allows you to setup ImplicitFields behavior for not recognized types.
The auto-adding behavior can be extended. To alter attributes mapping or add a support for new attributes you can set properties AutoAddStrategy.TypeMapper and AutoAddStrategy.MemberMapper. Both mappers are also extendable, you can pass your custom handlers to their default implementation constructors. To get default handlers list use CreateDefaultTypeMapperHandlers and CreateDefaultMemberMapperHandlers on AutoAddStrategy respectively. Please see the source code to understand how to implement your custom handlers.
Also you may implement your own custom IAutoAddStrategy; note that it's required to inherit AutoAddStrategy so you have an access to required protected methods.
You can enable System.Serializable attribute support by modifying AutoAddStrategy.AcceptableAttributes property. For this attribute ImplicitFields.AllFields mode is used.