Today's kitchens are more flexible than ever. No longer limited to a simple range, cooking options now run the gamut. Some homeowners opt for a wall oven and a separate cooktop, while others keep the range but add a second cooktop in an island or on a counter. Gas and electric are no longer the only mainstream choices; induction has made a comeback and is now offered by a variety of major manufacturers. Finally, all sorts of extras are available, from automatic sensors to slide-touch controls.