For ATC’ers; what is the additional risk in intersection departures?
The hazard was exemplified by the
Shorts 330 collision at CDG in May 2000. But not every hazard brings an unacceptable risk.
There's a considerable difference in risk management strategy between aircraft designed and operated to be robust to an engine failure at any moment of the flight, and the less capable aircraft that the OP is likely to be flying. Ironically perhaps, there's a greater potential benefit in taking the whole of a 3500 m runway in a Piper Cherokee than in a Boeing 737, as the likelihood of using the last 100 m of it in an emergency is greater.