When you're typing an answer, you normally want to refer to the question for details. However, it is annoying to have to scroll up to get to the actual question when there's already an answer. Is there an option to hide the other answers?
I like to see other answers as soon as they're posted. Often someone will provide a detailed answer while I'm still writing my own response. In such situations, I abandon my draft, up-vote the other answer and move on.
So if we implement this suggestion, I would be strongly in favour of showing the answers by default and providing the option to toggle to hide. I would also question whether it's ever a good idea to be unaware of other answers.
I have implemented this as a userscript:
Sorry for the non-smooth behavior. I am willing to add a sliding animation, but it might take some time to make it look good. Tables (ahem) don't transition properly and jQuery can't animate classes, but there's nothing wrong with moving styles out of CSS stylesheets, right?
I do, however, ensure the check box doesn't scroll away when you click it. It might be inconsistent with the behavior of AJAX updates (ahem), but I like it better.
Hm... maybe the "hide all answers" checkbox should be moved somewhere else? I don't think it should be hidden completely until you start answering (click textarea - visually locate and click checkbox - click textarea again -- not a good workflow)