You can have a photographer at the camera, framing and clicking the shutter instead of the software triggering the camera for you.
To do this:
Go to Settings, Screen Editor, Capture Screen, Uncheck Auto trigger Camera.
Then make sure your camera is connected with a USB cable. Once it's connected, wait for the countdown to complete, then press the shutter button on your camera, and DSLRBooth will download and process the photo.
Alternatively, turn off Live View on the Start screen and press the camera shutter button whenever you wish.