That or you could make a shortcut of it used just for -image.
Also, you can stop it and start it whenever as it will carry on downloading from where it left off if you don't feel like leaving it on for hours or need to do something
I made a handy shortcut with the -image switch built in, and keep that shortcut in the same folder as gw.exe. So it's not all up in my face every day, but it's easy to find if I need it.