While we can choose which field to order by when searching in advanced mode:
… we cannot choose whether we want to order ascending or descending.
Adding orderdesc modifier would easily make it possible:
order:likes is already descending, right?
So what you want is “the opposite of the normal order that this term means”.
Not sure about this, but… How about order:-views to start at 0 and go up, while order:-latest starts at the oldest?
struggling to think of use cases for orderdesc:likes or orderdesc:views, though I am open to possibly adding order:earliest (its quite rare to need though)
We should find a way to allow for opposite ordering for any ordering type (kind of a universal way of doing it), then easier to remember and use.
You never know what one could come up with 
I’d use orderdesk:likes to identify which type of material is the worst in terms of people likes and not create similar topics, or not include them in the lists.
orderdesc:views might possibly indicate topics that need some more useful information to get more attractions from organic search.
I think there might be more use-cases I can’t think of, why not just make it possible with a single operator.
I want this feature in order to support an “inbox” use case for processing forum traffic: I have a search that I want to sort by least recently posted (so that I can work down the queue of posts awaiting a response), and I can only get most recently posted (afaict).
You might want to consider using the Unanswered filter: /latest?max_posts=1.
However, I did also write a PR to add this sorting option:
Taking suggestions as to what the name in the dropdown menu should be, I don’t really like “Oldest Update”.
Eu estava procurando uma maneira de classificar os resultados por mais antigos (ordem cronológica ascendente, adicionando estes termos para futuras pesquisas nos metadados…) ao pesquisar dentro de um tópico.
Não consegui encontrar “Classificar por Postagem Mais Antiga” (só existe Postagem Mais Recente), mas tentei “Classificar por Tópico Mais Recente” e funcionou.
Acho que entendo a lógica, mas as palavras são um pouco contraintuitivas neste caso específico.
Uma opção de ordem cronológica ascendente/descendente seria, para mim, uma boa adição, às vezes tento fazer isso, e fiz em outros fóruns que permitiam. Frequentemente mais por diversão do que procurando informações específicas e interessantes.
Além disso, pergunto-me com que frequência as pessoas classificam por Mais Recente, em comparação com o padrão “Relevância”. Frequentemente uso “por Mais Recente” em muitos fóruns.