The warning for disabling auto power off is always displayed when the
camera connects. Sparkbooth does not have a way to read that setting on
You can change the white screen to another color or completely transparent.
But it sound like the real issue might be the duration which is come when
the command is sent to the camera to take a photo and when the photo is
downloaded to the computer. You can decrease that time by setting the
camera to take smaller photos, use manual focus, and manual mode.