I think you guys missed the point… Yeah, they are doable even now, but they are behind some hard tricks and require a lot of playing around, when they could be implemented quite easily, if Blizzard simply coded them straight into the game engine. Like they could just give arrow keys additional hot keys. I don’t believe that would be very hard to make, if done on the base code level (I mean, there’s hardly any lag when using the arrow keys, why couldn’t they change those to WASD keys as well?).
About the inventory:
They said they are looking into the option to easily increase the inventory size, so it’s likely happening. 