If you have the keys to spare (I love my G11 keyboard), you can bind the "Interact with Target" key for your alts to different keys. No need to switch windows for your alts to grab quest drops. Ok, alt 2 is done, use alt 3's loot key. Alt 3 is done, now use alt 4's key to loot. For drops that everyone can pick up, an "All Loot" key as your 2nd binding for "Interact with Target" is great.