Replying to comments, this would make it feel like an actual discussion

Basically: If people could reply to comments, it would make the feedback site feel more like a place to discuss stuff, rather than just a place to fill up with millions of posts. 

Replying to comments makes it so that you can really talk about the ideas and help out. like, if there's a comment you totally agree with, you can say that, and if there's one that you want to build on, you can.

Also, down-voting both ideas and comments would also be useful. That way you can say "I genuinely read this and I disagree". but voting and down-voting should have a 5 second limit on them so that people can't just go around voting stuff when they don't know anything about it.