When creating a league, you must select a set of scoring rules:
These are controlled from options available in the Manager menu:
These options lead to pages where you can create new rule sets for Regular Scoring and Set Scoring:
When you create a new rule set, it will be available as an option when creating a new league. There is no limit to the amount of scoring rule set that can be added.
NOTE: Once a scoring rule set is used by any league on the system, then it will no longer be editable.