It would be great if there was a way to change the support separation gap to not just be a multiple of the layer height, but set to a gap like the raft to part gap. Sometimes I want to print something at .2 layer height, but know that it will lay down plastic better on support at 0.15mm.
The raft print speed should be something on the speed tab. The first layer, of course, can be controlled, but the solid interface layer cannot. At higher speeds that would fine for infill are not as good for solid flat layers. The plastic has a tendency to string and not lay down a smooth flat surface otherwise.
There should be some sort of bounding box you can set for the auto arrangement. Just a simple parameter like a 10mm gap between parts or something. The auto arrange seems so random and often places stuff too close together.