There are many ways to make that list "editable" that make it harder for the user to accidentally delete data. I think the programmers would be able to make it work. If there were a problem with the type-ahead searching, that could be dealt with. Perhaps forcing a double-click in a particular cell to enable editing? Make type-ahead not functional until the user safely exits a cell? All possible.
I have begun to use the People view as a giant to-do list on screen, especially since I can add fields (facts) to view, and can restrict it to specific named groups or everyone as I choose.
I created new facts ("D-Cert', "SSDI", "SS-5", and "Obit" with description only. I changed the People view to show those new facts. Now, with a custom group, I can examine groups for what needs to be done. Using it, I can see holes in my data, and derive research direction from it.
Knowing what I don't have within a certain specific population (user-defined list) is very helpful.
I can also take this data with me in a custom report I built that has Name, M-F, Death Date, <.......the new facts.....>, and Buried Location. The report is "generic" in that it can take any custom list - and it becomes a research worksheet. I can then annotate the printed worksheet, then come back to the computer and update the fields I have resolved with collected data. I can then also clear the NO field and make it a YES.
Then I somehow (right now I'm doing it manually for immediate ancestors) create these facts in each (relevant) person, and insert "YES" or "NO" answering the question whether or not I have these things. If no, I need to get or do them. If yes, no problem.
With the custom report, I can use a user-defined list of people who died in a specific region, state, city, etc. Using this custom report, and the user-defined list, I then get a report that amounts to a hit-list of work to do in a genealogy field trip. Or research that's needed in the overall genealogy effort.
Of course, once I get some particular item done, I want to change the NO to YES. That's one additional area that the in-cell editing of the PEOPLE tab would be really very helpful.
So the in-cell editing would benefit me for all the ways previously discussed in this thread, plus reducing a tremendous amount of work filling in the yes and no answers.
Of course, I have to figure out how to (==easily==) initially get those user-created facts into the pertinent records in the 1st place. The end-product (new use of people tab and custom report working together) seems to be a really nice tool.