Working with lists mostly involves working with items as a whole, if that makes sense, e.g. deleting an entire item, marking an item as done. Ctrl+Shift+Enter only inserts a line break.
As for two formatting sections, formatting is its own section, whereas the the other formatting is a sub-section under shortcuts. In other words, one is for formatting syntax, and the other one is for formatting shortcuts. Maybe we should reword them!