You can use the WP Types plugin with BuddyForms. All Custom Post Types created by the Types plugin are available in the Form Builder.
Also any taxonomy created by any kind of plugin will be available in the form builder.
All custom fields created by the Types plugin can be used in the FormBuilder but they need to setup correctly to work with the Types plugin.
The types plugin us a special field naming. You need to add the prefix wpcf- before the slug.
If you create a field in the Types Plugin and give it the slug field-1 the slug in the BuddyForms FormBuilder needs to be wpcf-field-1