You can do this, it is how I have my league setup. It just takes some time to set it up. Look through all the options for team scoring and it should have something like "X points given when points allowed is between Y and Z". You will have to create a rule for each point option( 20 points given when points allowed in between 0 and 1, 15 points given when points allowed is between 2 and 6, etc.)
Hoosier is correct, you can do this -- email our support staff if you need help