A tool that allows drawing multiple freehand regions and adds them as overlay objects. In response to http://forum.imagej.net/t/test-if-roi-selection-is-closed-finished/723/3

MultiFreehand_Tool.ijm

macro "MultiFreehand Tool - C00cT0f18M" {
  xs = newArray(1);
  ys = newArray(1);
  getCursorLoc(x, y, z, flags);
  xs[0]=x; ys[0]=y;
  lastx=x;lasty=y;
  leftclick=16;
  while (flags&leftclick>0) {
   getCursorLoc(x, y, z, flags);
   if ((x!=lastx)||(y!=lasty)) {
     xs = Array.concat(xs,x);
     ys = Array.concat(ys,y);
     makeSelection ("freehand",xs,ys);
     lastx=x;lasty=y;
   }
  wait(50);
  }
  run("Add Selection...","");
  run("Select None");
}