I want to tab! Alt+S requires un-doing years of cyber conditioning!
Anyway, it still requires clicking reply to open the extended reply do-hicky, which I have no need for other than having the option for the shortcut. So it's compounding additional clicks and keystrokes to compensate for the expected action being absent.
While we're quoting:
With a Quick-Reply you can use bulletin board code and smileys as you would in a normal post, but much more conveniently.
It's not being as convenient as it ought, the documentation supports my kvetching.