1. no surprise there
2. this is not possible. Sections are numbered sequentially, there can be no gaps. There could be some Continuous sectionbreaks that may make it SEEM like there is a jump. But it is not possible. The Object Model does not permit it.
3. no surprise there either
4. not sure what you mean.

You could remove all section breaks, thus making one section for the whole document using Find & Replace.