Gentlemen, thank you for your input, your points have been noted. We try to deliver small improvements to the site continuously, and improving the discussion capabilities is always high on the list. As for the Headline comments, I'd add the ability to edit one's own comments as a feature we'd like having.
Rob, it's true that in the Groups, replies are added to the end of the sequence, which is reminiscent of the bulleting board sites (Britmodeler, ARC or Aeroscale come to mind) than the reply-to-reply tree one we see on for example Hyperscale. Which of the two is more convenient has always been a matter of debate. What we like about the current model is that it allows to conduct a WIP simply by adding replies to one's own original posting, thereby holding the enitre building blog in one place. This is something which would be difficult to do in a threaded discussion such as HS.
Lastly, I wouldn't underestimate the potential of using a smartphone as a iModeler camera/posting device. Some of our (particularly younger) members have already been doing this, but the functionality could be made so much better.
