I apologize if this is already a feature That I haven't found yet. I wonder if it would be possible to set a scallop height for the outer layer while maintaining a larger layer height for infill and any inner layers. This would allow the best visual quality while maintaining strength and print speed.
For example If I am running a 0.4 mm nozzle and I set a 0.06mm scallop height on straight vertical walls the printer would print 2 layers at 0.12mm for the outer shell and then run the inner shells and infill at 0.24mm and when it reaches a radius or angled wall it could change to 3 layers at 0.08mm while still printing all internal layers at 0.24mm .
(A scallop height would be the depth of the ridges created by the layer lines.)
A simple alternative to a scallop setting would be an internal layer height with two external layer heights one for vertical walls and one for everything else.