It would be cool if users could create polls in their discussions! It would be much easier than people actually replying to it saying what they prefer/like more. There could be like an Official poll tab when you click the "Polls" button on the sidebar and a User Created Poll section, where users get to vote for polls, it'd be like a normal post, but with a poll!
I think you should be able to comment on each chapter of a fanfiction as well as the home-like screen for said fanfiction for people who finished reading it.
The spoiler tags don't really have a definite end of what the spoiler is, so it becomes hard to tell what's spoilers and what isn't when there are multiple lines.
Example:
Do not read this:This is a spoiler
Is this one too?
This is making me unsure of how to clearly mark spoilers in my OC entry, since some of the background is spoilery.