TOPIC: Linking DT Register fields with JomSocial

In the configuration area of DT Register under last tab JomSocial, I can link JomSocial fields with DTRegister so that during registration, the fields are prefilled with the values from user profile in JomSocial.

But there are just the nine standard fields
company, title, adress 1, adress 2, city, state, city code, country and phone.

I would need more flexibility and add more fields from JomSocial user profile on the registration form. From what I can see I am totally restricted on the nine fields, right ?

Or what about the option to creating custom fields and linking them to JomSocial ?