It's just a side effect of an auto transmission, without a big stall when you leave the line your only slightly above an idle rpm, look at a dyno graph and you'll see how much power (or more importantly torque) your making at a such low rpm. There's your reason why you 0-30 times are so slow
Bigger stall will increase 60 foot times dramatically, but not recommended for a street car as it makes daily commuting a pain in the neck...