Leveling the playing field can be a tough issue. You want to provide opportunities for people you also have to worry about inadvertently harming them. A lot of it may be based of the approach that you take it helping people. It can be beneficial but you have to be careful with it.
Yes, it is acceptable to treat aboriginals differently under the law, because treating them differently allows them to continue to practice their traditions. As long as their traditions do not directly hurt anyone else, they should be allowed to continue their own practices and customs. They were in the area first, and should not have to comply with the new government, as long as they do not hurt anyone else.