I think most professional cameras have a voice annotation button, for recording scene and subject notes. At least my D2X did, which was the last pro DSLR I could justify.

I keep wishing for the same button, mid line, every time I'm working around some kind of"proprietary" serialisation* I find in in house projects.

*I tried to coin the acronym OBSEC to mean security by obscurity, fifteen years ago.. but I have since figured how much pointed derogatory comment serves no enduring purpose unless it at least, like SNAFU and FUBAR releases the frustration felt by the observer.