Ok my bad, I read up on it a little and I'll pick and choose certain aspects I found of merit.
These would be MY version of the rules.
1) After 6 years slaves were automatically freed (This is OTL true but it only applied to other Jews, foreign slaves were out of luck)
2) Although an owner could beat a male or female slave, she/he would have to avoid serious injury (In the Jewish system the limit was to the eyes and teeth, as well as incapacitation to 2 days)
3)A slave was considered a piece of property, and thus could normally be resold to anyone at any time for any reason. If a person bought a female slave from her father and she displeased him, he had no right to sell her to a foreign owner. If the owner required her to marry his son, then the owner was required to treat her like a daughter-in-law. If the owner marries his slave and later marries another woman, he was required to treat his slave as he previously had. If he violates any of these requirements, then she must be emancipated. (This only applied to hebrews OTL though)
4) No Rape.
Ok so that's kind of a rough draft for my system. I'm not condoning it but I thought this system is much better then some others.