I really do like how the scoreboard looks right now showing your K/D/A and clicking brings up the in depth scoreboard.
I think that LoL needs another button that will cause a window to drop down and show the heros, and their respawn timer. The current scoreboard, while great at showing more in depth stats, doesn't quite do the job in the middle of the game trying to push a tower but are unsure of how many heros are left alive.
Also as a side note, can there be an option to show the hero's name instead of the player's name over the in game hero? Sometimes its hard to call out/type out some of the names when you can't remember the hero's names. Plus this way might make it easier for some of the newer players to get used to the hero names and abilities.