The editor should allow you to see in real time how it interacts with the data. Being able to test the INI file prior to loading some file would make it much more manageable to read a variety of data format and insure that it has the expected behavior before starting the connector and having to use a trial and error approach. A good example of this is what Microsoft does with PowerQuery in PowerBI. This would allow troubleshooting UFL issues much more easily and allow more people to use the connector without having to spend a serious amount of time testing all the various scenarios.