Version 3 fit curve for differing x an y fit

In version 2 it is possible to have a different x-axis and y-axis bezier fit. This would be necessary, for example to create a rugby ball shape. In version 3 the fit curve seems to only have one axis and the x-axis and y-axis are locked to be equal. Is there a way to use fit curve for a different x-axis and y-axis fit?