I have a suggestion that could effectively cut the print time in half for some high-detail prints.
Just print the outer walls with a different layer height from the rest. It would allow the print quality to look like it was printed at 0.1mm layer height, but with the print time being close to a 0.2mm layer height.
The supports can also be printed at a multiple of the layer height (which it already is, Support Infill Layer Thickness), but the support roof could be printed at the same layer height as the outer walls.
The inner walls are a bit tricky. On one hand, you could totally print it at a multiple of the outer wall height, but that could result in imperfections on the outer wall. And on the other hand, if you print it at the same layer height as the walls, it adds to the print time.
My suggestion would be to print the first inner wall at the same layer height as the outer wall with all subsequent walls with a multiple of the outer wall height. You could, of course, make this user controlled.
