I assume this is a popular request but I think ELIF functions would be very helpful in making functions easier to write. Nested IFs can get cumbersome and the alternative SWITCH can be difficult given a large set of possible values. Converting single and multi select fields into a logical format would be much simpler using ELIF. This would likely also generally reduce the need for dummy fields used for steps in a larger function.
I find the select fields to be very useful for users and would like to be able to run automations and calculations via select fields but it seems more difficult than necessary. I think ELIF would reduce the complexity.