The repeating crossbow, invented during the 4th century BCE and perfected by Zhuge Liang during the three kingdoms period:
http://www.arco-iris.com/George/chu-ko-nu.htm
After reading the description, I would say to treat it as follows:
Light Crossbow (-10; max of 140 on the attack table) Use the range modifiers for the Long Bow (but only up to the 201'-300' range, since the range given in the description is 75 yards (225').
When attacking a crowd (little to no space between the targets), if the wielder is just shooting into the crowd, the targets will be random, and he gets full OB against all.
If attacking a single foe, only 1d10 of the 10 attacks will hit, first attack gets 1/2 OB, the rest get 1/4 OB. Against multiple foes in a small area, I would say just 1/2 OB on first attack, 1/4 OB on each subsequent attack.
This is a weapon made specifically for attacking crowds, it will be much more difficult to use accurately against individuals, or even small groups of individuals.
And I fully agree with the 3+ minutes to reload once all bolts are fired.