I would appreciate being able to tune the fences color based on numbers, not just sliders.
Also, perhaps optimization for certain screen resolutions so that if there are fences spanning the entire monitor, they would take up the whole horizontal space and not leave cracks on the edge or in-between.
I realize I can do this by disabling pixel spacing and not keeping fences to multiples of icon sizs, 3x3, 2x2, etc... however that is not really an elegant solution.