Hi,
a) there used to be LWP::Debug, but it's deprecated - see https://metacpan.org/module/LWP::Debug on how to add a debugging handler to LWP::UserAgent.
b) You'll have to implement your own serializer - see https://metacpan.org/module/SOAP::WSDL::Factory::Serializer on how to do that (and use the builtin serializer as an example).
Best regards,
Martin