A few things:
All the weapons have two "weapon length" stats. I'm not sure if anyone uses the weapon length stat for projectiles (arrows, bolts, thrown) at all.
You can't search items by difficulty, which is pretty handy if you're planning future gear along with your future build.
There's no way to really know what weapons can and can't block as well as which can only be couched. Well, you can ask people, but a tag on those items would be nice.
Also, I'm not sure how big of a project it'd be, but an equipment planner would be nice. If someone's feeling particularly awesome, being able to preview the combined appearance of a particular outfit would be amazing