If I want to use the bulb setting for long exposure on the Nikon D40 I have to hold the shutter button down? That seems a little silly. The manual says I have to hold it down, or use the optional ML-L3 remote. I guess with the remote I just have to push the button once, then push it again when I want the camera to stop. Is there anyway to get around this? Is there a way to just push the shutter button and it stay open until I push it again?