I have some real problems with the knob idea. Firstly, it's not fine-grained enough; I often want to put something in for a time that's not a multiple of 15 se

I have some real problems with the knob idea. Firstly, it's not fine-grained enough; I often want to put something in for a time that's not a multiple of 15 seconds. (And the longer you go, the worse the resolution gets.) Secondly, for the rare case when something does need to be microwaved for a long time, it makes inputting that time linear in the amount of time when it could be logarithmic!