Hi Thomas,
In my case with Hot Question, it would have been simple to change the string from "ID" to "id" but then it would not have "looked" the same as the rest of the column headings in the downloaded file. Besides, in my case, I felt that it was more logical to have the ID field come after the first and last names since it is the Moodle ID number for that person, so I just reorganized the file structure.
I think it would be a simple fix too. The problem comes down to getting a Moodle developer to take the time to fix it.