Member formula is missing the ability to execute chart logic for limited dimension intersections, similar to an Essbase FIX statement (e.g. ability to calculate one cash flow account). Can see that the function is in the dll but it is not exposed to the API functions.
General approach is to use a Custom Calculation function so that you can limit the calculations to what is actively displayed on the forms. Disadvantages of this approach:
•By not having the calculations on member formulas, you lose the ability to do drill down formulas
•Does not make use of multi-threading
Can result in some duplication of code