Steve's idea is the method used by Richard Sanders in his "Three Ropes and a Baby" rope routine. TRAAB preceded "Fiber Optics" and came with a set of the nice Camirand Magic Elite ropes. Fiber Optics is TRAAB on steroids.
Anyway, back to the ropes, I think that Richard used something like Elmer's Carpenter's Wood Glue in the ends AND he actaully squirted in a small glob at each end of each rope. This resulted in a slight imperceptible "swelling" or a slight "buldge" at the end of each rope. This is a great idea because the buldge assists you in two ways as you perform TRAAB or Fiber Optics, namely:
1. It helps you keep ahold of the ropes that nest inside of your little pinky finger (so that you don't drop the rope if your finger slightly lessens its pressure on the rope), and,
2. The small buldge provides a great tactile sensation of when you have come to the end of your rope (no pun intended) and it helps you know "when to stop" and to not pull the rope completely through.
So, after tucking the rope end back into the rope about 1", what I do is to pinch the rope end at that 1" place (to keep the glue from going past the frayed end) and I then shoot the glue into the remaining end until I completely fill up the end (except for the lastmost 1/4"-1/2") and the rope "end" starts to buldge from the glue inside. Massage this glue around until it is nice and uniform (and "round") and then let it dry. When dry, you'll have a nice rope to use.
Also, if you plan on HAND-washing your ropes (as they get dirty), make certain to NOT use a water souluable glue for this purpose. I think that Elmer's Carpenter's Wood Glue is not water soluable.
BTW, I think the reason that Richard does NOT fill in the last 1/4"-1/2" of each end of the ropes is because the glue he uses dries "slightly yellow" and would contrast with the bright white rope. If you are not washing your ropes, just use Elmer's White School Glue.
Hope this helps.