It makes no sense that the screen locking setting and the screen power saving setting are two completely unrelated things located in different sections. Usually one wants to change both together. Reproducible: Always
I assume you mean the modules in system settings? I've noted your opinion, so if I see lots we'll mabye do something, but it's also not a bug. There's some overlap between the two, but they're not the same thing. The current KCM layout was designed in response to a user feedback survey - they're not placed randomly.