I want to be able to choose in the frontend user interface per profile selection; in what method it should be calculated.

There is an old and a new way profile selections are calculated. In the old way it would look at what customer adheres to all layered data conditions in one and the other column.
Example: A customer has an order with 'these three conditions' and has a different order with 'these other conditions'.

The new way cannot do this as it applies the conditions of the second column to the rows outcome of the first column in the selection. Sometimes this is what you want, but not always.