Seems anytime you add a bryce you get the start/main menu as a gadget. There does not seem to be means to remove it, or at least I could not figure out how. It would be nice to be able to remove that. I guess same applies for the default digital clock.
The new gadget system uses the same mouse controls as windows for now, ie. modifier key + mouse button for actions. So whichever key you use while clicking to open the window menu is the one you use for the gadget menu.