Very good question!. Well, now, the section "People under study" rsc197 is not a hierarchy, it's a flat section without parent <-> children relationships. It's possible to transform it with the thesaurus needs and include it as other hierarchies inside the thesaurus... but the fields of people are not the same that other thesaurus sections, like onomastics or toponymy, for ex: the field "term" hierachy25 in thematics is the same field in toponymy or onomastic, but, it's not in People, the "term" for People need to be the combination of name rsc85 and surname rsc86, 2 fields vs 1 ...
name + surname = term
Besides we will have problems with the filter, because the fields are not compatible between thesaurus and People, maybe ,the main question could be; how can include the section to be searchable like other common thesaurus sections?
Well, I think is possible but... I need to do some test, I will back with more detail.