My suggestion for improving the auto-complete feature when importing cards is to have auto-complete try to match cards in the expansion that is set to in the default values first, rather than the best match from all the expansions.
Example: If I'm adding a bunch of Theros cards and try to add a Soldier of the Pantheon, I have to type in "Soldier of t" before it matches, because it first matches Soldier of Fortune. However if I select Theros as the set in the default values section, it would be nice if it matched any Theros cards first, that way I could type in "Sold" and it would match Soldier of the Pantheon, I'd hit Tab and done, added to inventory with much less typing required.