Open Ended Accumulators

I have a client who has a set of Entitlements with custom Accumulator Periods that have open ended (or no Through or End Date) Accumulators. Having no End Date on the custom Accumulator Period creates continuous results from years' back for the current results in Results by Calendar Group.

When creating a Custom Accumulator Period, you can only create and/or use a Begin Date element on the custom Accumulator Period. The Entitlement setup does not allow for custom Through Date or End Date setup in the Absence Entitlement configuration.

What is the best possible resolution to creating a custom Through Date or End Date when setting up an Absence Entitlement that needs a custom Begin and End Date?