I often data-enter new references manually, for various reasons. To that end, it would be super helpful to be able to customize the Reference Panel for data entry purposes. The panel has a lot of fields, many of which I never use. As a result, I usually have to either tab through the fields, or lift my hands off the keyboard and use the mouse to switch fields. Being able to disable particular fields would save time and trouble.
Also, being able to reorder the fields would be helpful.
Finally, the list of reference types includes many that I never use. Being able to customize that list by disabling unused reference types would make creating new references simpler.