Add a start date and stop date option on Usage Calc Rules similar to the start/stop dates on VEE Rules.
Usage Rules cannot be deleted via CMA, and if they have ever created an exception during Usage Calc then the rule cannot even be manually deleted via the User Interface. Which makes deleting via a SQL statement the only option, but that's not an option for cloud-based environments.
Adding a start and stop date option would help keep environments from getting out of sync due to deletes via UI or SQL and would make testing and building usage groups an easier process during implementations. It would also make post go live maintenance easier if support teams ever needed to adjust usage rules, they could stop an old rule and start a new one rather than having to change a usage rule configuration or building an entirely new usage group.