One thing I dont like with S3D code is when printing with rectilinear patterns the first solid layer after infill is in the same direction as the preceding infill layer, I think if it was in the opposite direction it would bridge over the infill better.
Its actually quite dumb because if you have an infill layer and the next layer is half infill and half fill, then the infill portion of the next layer is at the correct opposite orientation but the fill proportion layer is at the orientation as the preceding layer!