I came across this field last month and was amused by it. In the race definition, you can add a field "rNumHands" and set it to any number you want.
There are some restrictions on how this works though, HL considers only 1 of the hands to be a primary, the other 3 are secondary. I have not figured out how to modify additional hand sets to be considered primary.
In my tests the following happens on a 4 handed character, you can wield:
4 one-handed weapons, only 1 gets the primary bonuses unless you have the feats that grant off-hand weapons the damage bonus.
1 two-handed weapon and 2 secondary weapons. The two-handed weapon gets the primary bonuses.
If you have a shield equipped, there is a bug. You can somehow wield a shield even when your hands are completely occupied (like the 4 weapon scenario), there's something wrong with the logic. You can also only wield only 1 shield ever, HL throws a validation error if you try to load 2 shields. I think this is due to the base D&D logic for calculating armor.
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