The flame, even in the newer ones, not to mention the original 37K BTU burner and everything smaller that followed would be too large and set the felt seals on fire, something that could happen accidentally even with the stock single port 18K BTU burner. In the Sears modulating burner, the flame comes on full and modulates down so you have to have a bigger flame to get the smaller flame and they started off larger than 18K BTUs. You are saying that it would be faster because it would taper down instead of cycling on and off. Modern thermistors instead of the old heavy metal disc thermostats that took so long to cool that the temperature in the drum dropped way down when the heat cycled off would provide a much faster response and shorten the cycling time which might speed up the drying by keeping the temperature more even.