The only feature I'd like is to be able to collapse threads. When there's lots of comments it can sometimes be almost impossible to work out what comment someone is replying to.
Oh, how weird. I've seen that [-] for god knows how long but it never even occurred to me that it would be a collapse button. For me it's in the "wrong" place, I'm used to expand/collapse functionality being on the left of the item to be expanded/collapsed. Thanks for that.