First I'd like to say this is a pretty slick package you've put together. It's well made and simple, yet effective. I've been wanting to ditch my Xenforo install for a long time just because it's so overly convoluted for what it is.
Anyhow... a few things I'd love to see incorporated...
- The ability to add forum category icons while in the classic table view. Possibly with multiple states to easily show if the category has new post or not... Like this...
http://i.imgur.com/wPJ0E2J.png
- A forum preview option. So you can see exactly how your post will look before submitting.
- A sign up block that can be enabled/disabled on the front page. Like this...
http://i.imgur.com/3Hj5oy7.png
- Ability to leave forum description blank.
- Ability to automatically insert images or video when you link an image or YT url. If the image dimension is smaller than the width of the forum then it uses it's own dimensions. If it's larger, then have it automatically justify. I only suggest this because it's something I've become accustomed too with past forum software, plus I think the image/YT insert buttons are a bit complicated for the average user.
- Forum polls.
- An FAQ feature. I know you could just make a forum thread with your FAQ. However, a more formal FAQ would be nice. This is the FAQ set up I have on my Xenforo based site...
http://i.imgur.com/sZmAkAV.png The answer is expanded when clicked on the question.
- A wiki feature or integration. I see more and more Minecraft sites with wikis. It's such a great way to convey information in a neat organized format.
I realize a lot of these suggestions can probably be added via modules? However, I also think they're all great features for a base system like this.