- New "pending edits" state for posts in the moderation queue. This is helpful in case you want the post author to make edits before accepting it, but you don't want to just delete the post entirely. And it lets other moderators know that it's under review.
- Moderation queue notes. I think that having notes attached to items in the moderator queue would also be helpful, especially in conjunction with the new state above.
- Ability to optionally alert the post author of moderator notes on their post. Perhaps this could be delivered through an automatic PM, or somehow attach the notes to their post in question and send them an alert. But it would save a moderator the trouble of having to manually go through the steps of PMing the post author of any changes that need to be made. This would, of course, be optional, since you might want to keep some notes private.
At minimum, I'd like the first two bullets. The third bullet would be a plus.