And that order doesn’t change when there is new posts? So there would be different listing in /latest that in category level? I would guess that would break the core function, in tech and idea level, so deeply that it won’t happend easily, if ever.
That sounds more WordPress style than how a discussion forum acts.
But closing all topics and playing with publishing times you can get that. But again, then a WordPress or some other CMS would be more logical choise.