Hi Sean P,
Actually I prefer to work in Winding (non-zero) mode because I need curves in the counter direction to work with Fontlab. But I did not find a way to make Winding (non-zero) mode can be used as the default fill mode.
The problem in version 1.8.2 is, after I do "subtract", then I have to change the fill mode to "winding" and again I have to change the direction of one of them. That's too troublesome.
In version 1.8.0 after changing the fill mode to "winding" I no longer need to change the direction.