/loot all, I think it was added along with the new UI button. Also /pause is tenths of a second, so you wouldn't want 150.
Also don't forget /hidecorpse looted (auto hide corpses once you've looted them - sadly has to be redone every time you log in)
That said, I'd just loot manually because the amount of worthless shit you wind up deleting later to make room makes auto-looting even more annoying than just picking out the good stuff. Also it breaks if there's any no drop shit and won't grab it all, unless you have lootnodrop off, which can be a bad idea.
I do use a button to target the corpse and /loot, it saves a lot of headache. At some point they really broke clicking shit to loot but that may have been fixed.