They can...
Yeah, only if they're a moderator
I meant if you want your topic locked then you simply PM a mod.
What Jane is saying is that it would be easier to not go through a third party (moderator) in order to get your own thread(s) locked. It's easier being able to lock your own created thread(s).
I think members who make their own topic should be able to close their topics.
Good idea?
Yes it is, near the topic name should be Lock and Unlock or just Lock (For Ever). That Members can lock it them self, when they want to lock, if mod or founder locks it, then member never can open it again. This IS good Idea.