1. I agree, we will do it in version 1.2
2. We will add option to set tools order in the future.
3. Give me more details - do you mean snap in edit transform, or maybe rotating canvas?
4. When you copy selected area, Artstudio automatically trims transparent pixels, and clipboard contains trimmed image. Then when you paste it, it pastes in the center of selection. You have 2 options: use Edit>Copy Special>Copy Without Trim to copy without trimming. Or select area, then tap Layer>Duplicate (in top manu or layers popover) to copy selected part to a new layer (and keep location).