I think it would be quite useful if while reading a literature work on da, it would be possible to post a comment that is linked to a specific section of the work or possibly a quoting feature to reprint some of the original without retyping it yourself. This would make it easier to comment about specific points in a story, or clearly notify the author of an error.
You can copy/paste and use the blockquote feature to do this I suppose. Or an inline line number being shown and referring to that. I hope they could edit the comments features in the film/animation to show those comments in those sections as well. An option to show them alongside other ones, rather than going through scrobbling to find them.
I hope not, because they might add the same thing to images afterwards... a bit like how facebook's tagging works except it'd be a comment only... No thanks for me.
Although there is the obvious copy-and-paste option, I think similar to film deviations, perhaps selecting a line number of having a nice way to use HTMl to quote, would be a lovely addition for literature deviations.
You can select text in a lit deviation with your cursor and just copy/paste it into your own comment, then either put quote marks around it or style it, like this, like this, or in a <blockquote>.