As both Pilot and ATCO the answer's obvious - Vectoring. It's not always possible but if you can leave the pilot to fly his own speed profile and you just put him in the right place then you've done your job. If you start applying speed control without knowing the characteristics of the aircraft involved you could be asking for trouble. Be aware of the speed yes, but don't alter it unless you have to. Check your PM's for a further point.
Feel free to discuss in work if you wish
