org-insert-labeled-timestamps-at-point

org-insert-labeled-timestamps-at-point is a variable defined in `org.el'.
Its value is

nil

Documentation:
Non-nil means SCHEDULED and DEADLINE timestamps are inserted at point.
When nil, these labeled time stamps are forces into the second line of an
entry, just after the headline. When scheduling from the global TODO list,
the time stamp will always be forced into the second line.

You can customize this variable.