Hi,
this is no possible natively, anyway you can do this with a simple CSS code like this:
#member-registration .z-content{display:block !important;position:relative !important}
#member-registration #jsn-form > ul{display:none !important;}
#member-registration .jsn_registration_controls > *{display:inline-block !important}
#member-registration .jsn_registration_controls .next-button{display:none !important}
#member-registration fieldset > legend{display:block !important}