A knob of butter is only a blob on the end of a knife and the butter-fondness of the cook is more relevant than the actual quantity there, but I very much agree about the 2 or 3 settings, given that I haven't used a gas oven since I was at school.

Mind you, having to find my conversion chart for Fahrenhiet vs Centigrade is irritating, which I assume you also find (in reverse)!