I think it would much be more aesthetically pleasing if you could label a card in the decklisk to be a general, or if it would recognize lists as a valid EDH deck if the General is in the Sideboard.
While perusing a few lists, I've seen deck names that explain what the deck does... but the deck will have 2-3 legendary creatures that could potentially be their general.
Also, being able to sort inventory by a format (Standard, Extended, etc) and see all the cards in it, the ones that you both own and do not own would be incredibly helpful to adding cards into Inventory. This is probably the only real hurdle stopping me from adding my already sorted cards.
If these functionalities already exist and I've missed them, I apologize - I've looked for a while to see if either/or could be done and I can't see them. Otherwise, this is a great website and an even greater organization tool. Unbelievable work so far, keep it up.
Thanks,
Josh