Cheers, Sean. I don't like electronic nannying either. I wasn't asking for any additional bells or beeps -- it was more of some sort of obvious/positive sign that something was "wrong" -- ie., the camera does not fire. Something is wrong.
If one forgot a lens cap on the camera, on aperture priority, you'd have a pretty long exposure upon tripping the shutter (you'd hear the shutter open for a long time). That would tell you something was wrong. If you were on manual exposure, looking through the VF the meter would tell you "underexposure". That is an immediate sign that something isn't right.
If you didn't have a battery in the camera, the camera wouldn't turn on. You'd know immediately something was amiss.
The R-D1 is my "off duty" camera. I've had it about 2 weeks. One day last week I got home from work and left the pair of beastly Canon Mark II's by the door. My little son was doing something interesting, so I grab the R-D1, flip the switch to ON, I focus and meter and shoot shoot shoot. The camera shoots, I cock the shutter, the camera shoots again. With the camera at your eye, everything sounds and feels RIGHT.
I hit the screen button to review what I've shot. Lo and behold, no card.
So yeah, maybe I got sidetracked the night before downloading the disk and went to sleep without putting the disk back into the camera. That's bad habit number 1 that will be remedied. Take a disk out of the camera, put another disk in. Immediately.
When I worked with film cameras, I always put a fresh roll into the body (I pretty much used one type of film) immediately after I took the exposed roll out. Good habit.
Digital perhaps has made me develop sloppy habits.
I still think Epson overlooked this quite simple "check". As it stands, if the disk is full, camera will not fire. If the buffer is full (hasn't happened to me) camera won't fire. So if there is NO DISK, camera shouldn't fire either.