Something I'd really like to see that I don't think would be very difficult to add would be (ideally) a way to search for other accounts and get basic public information about them. Essentially a spot where you could put in an account name and then see that account's score, current arena stats (as shown on the arena leaderboards page), and possibly even last time the account was active.
Failing this, it would be handy to just have an option to display all 500 spots of a current arena leaderboard on a single page to facilitate finding people via ctrl-F. Right now, if I want to check and see how friends' arena decks are doing, it's rather tedious to have to page through 20 different pages of leaderboard per arena.
Thanks!
