A great drill for distance control; start off at the hole and in a relatively straight line drop a ball approximately every 3 feet until you get out to 15 feet. Start at the 3 foot putt and go all the way to the 15 foot putt. The only thing that should change in your putting stroke is the distance you take the putter back and through
I would also suggest this drill from off the green in order to develop touch for when you should putt instead of chip.