In one of my recent sketches (http://processing.tavernmaker.de/JumpMan) I'm using key-control. Now, I've got reports that the keys are sometimes not recognized, and I wonder if this is a bug or sub-ideal programming.
They way I do it is

Each "player" has one "hotkey" (key stored in the according object) and WHILE IT IS PRESSED it is attached to something, whereas while it is not pressed, the links break. The according code I use it (simplified):

Code:

void keyPressed()
{
  for (int i=0;i<Players.size();i++)
	{
	 JM = ( JumpMan ) Players.get(i);
	 if (key==JM.HotKey) JM.free=false;
	 }
}

void keyReleased()
{
  for (int i=0;i<Players.size();i++)
	{
	 JM = ( JumpMan ) Players.get(i);
	 if (key==JM.HotKey) JM.RemoveSprings();
	 }