Those are fantastic suggestions, Lucas. I think the first three are viable, and I can start getting on those immediately.
Mobile is a different matter. The version of Xenforo we're on - 1.1 - has jack-all support for mobile, unfortunately, so there's not much we can do to improve the user experience at the moment. Thankfully, the newer Xenforo 1.2 supposedly has better native support for mobile. There are a couple of other notable improvements in the newer version that I'd like to pick up, as well. It's just a matter of finding a block of free time in my calendar in which to schedule the site migration, along with porting over and testing the custom code we've written.
Hah, pithy statement generator? That's a fun suggestion. We'll see what we can do!