Thanks for the tip shadowsports. I just sent Canon USA via the feedback link a request to add precapture to the camera's features via a firmware update. If Canon would get more messages regarding this, then maybe there might be some hope, although ma...
If there is no technical obstacle to adding pre-capture to the R3 with a firmware update, then it would be very classy and above all good customer service for Canon to add this much desired feature to an otherwise great camera.