Today there is a big gap for doing what-if scenarios. The current format requires an entire series to be built, but what if you need a very large number or better yer, you need the end user to have the flexibility to select any value within a large list of possibilities, but one that also requires a lot of precision. My suggestion is a 'single value' solution. It simply allows the end user to type in a single value, that value is a named parameter that can be called into other DAX functions