Gordo Thank you very much for explaining. Though I think this kind of behaivior is something not people expect from drop usual down menu, so I guess it might be confusing for many people. This menu is only suitable for cases you have few people in your library, then it is really easier to do everything without even toughing keyboard, just with the mouse.
However, when there are many people, using keyboard is easier than scrolling down long list, but it that case you can just press F2 and voila, you have your input field, where you can find necessary person with just a few key strokes, and there is also a picture near to the name.
So my point is, the functionaliry you are looking for already exists, you just need to select “Enter person name” isntead of “This is…”.
Hope that makes sense.