Financial Model Suggestions

Dear Paul:
Given that we are seeing more and more PV+BESS systems with incentives, there is a need to be able to have an IBI that is vector based. 
For example for modeling SGIP incentives in California, the total SGIP rebate is split into 50% upfront which can be modeled as an IBI.
The remaining 50% is split into 5 annual installments of equal dollar value.
Will be nice to direclty model that. Today we run SAM once, get annual kwh for each year and then convert the IBI into  PBI and re-run SAM.
I've automated that completely with LK but having a direct input will make it simple.