The standard Contact Reports do not permit any reporting on associated Custom Tables.
Being able to record data in Custom Tables linked to a Contact is great, not being able to report on it is very poor.
For example, if the Custom tables were Job Tickets you might want to report on these for specific Contact.
In the case of our client the Custom Tables are Property Records. We need to be able to generate a report detailing what properties are linked to a Contact, ideally we would want to be able to include specific Custom Table data fields.