I'm fairly sure it's either a Reddit or RES feature, but whenever I select text in a comment and then click Reply, it'll copy that text to the comment box and add a > in front so it'll turn into a quote. It makes it a little quicker to respond to a specific part of someone's message.
I'm no IT bird and as such I don't know if this is something that can be implemented easily(if at all). It'd also require more JS, not sure if that's an issue as well.
In any case, let me know what you think.
Edit: I'd like to suggest something else, should I make a secondary post or append it to this one? I'd like to avoid cluttering up the front page.