Actually, it's not the name changing itself I'm interested in. It's the maintaining privacy when you do it.
I want to post something a bit confidential about myself. I'll change my name when I talk about it, and set my profile to private. I'll write in the thread, but then what? If I change my name back will my posts all revert to my usual name? Will people be able to see my profile from the temporary alias in the thread?