We have developed a custom field type. By adding it to the Custom Fields -> Field Types in the advanced settings (see screenshot), this custom field type can be selected, without any problems, when creating a new field for a News item (see screenshot).
However, we want this field type also to be available for a dynamic module content type. But it seems that the list of field types (see screenshot) that is available for a custom content type cannot be modified. It seems like this list is even hard coded in the underlying .ascx.
Someone has experience with this and have a workaround?