I've often wondered what a forum would look like where you could make the equivalent of 'aside' comments. The way someone might, while you're speaking, say softly "hyPERbolee, not HYper-bowl" to correct you without interrupting.

Perhaps a good example is StackOverflow's Q&A format w/ comments and chats. You can comment and move to chats but the emphasis is on the important part: the question and the answers.

Allowing voting on these "asides" in StackOverflow permits all of the usual stuff while relegating them to the asides they are.

Of course, in the case of what I used it for, it is generally impolite to offer advice unasked but the nature of slow feedback loops means it's better for me to offer an ignorable piece of thing. i.e. if you think I'm an idiot, I want you to have the power to ignore me. That is only polite to compensate for the brain-hacking strength of having text describe you. You can't ignore it afterwards.