I think that it's a very valuable skill to be proficient in dealing with stuck/failed pedals.
The chance of a pilot EVER have an emergengy of this nature is almost nil, however, the skill that you aquire enabling you to deal with a pedal emergengy may well help you avoid an accident at some point in your career.
For example, you are still fairly new to the game..flying at altitude for the first time, you come in to land on a mountain top and the wind isnt quite what you thought and all of a sudden or short final you run out of left pedal (on this day your in a Bell) and the nose seems to be wanting to go right and you cant stop it.
The skill and knowledge that makes you compentent in dealing with T/R emergencies, will definatly help you out in a situation like this. Knowing exactly what happens when you raise/lower collective, increase/decrease RPM, knowing that if you are power limited and you push in more pedal it may slow your RPM, which results in lower thrust from the T/R etc....you need to instinctively know what to do in a situation like this. Do you have to put it on the ground? Is it possible to fly away? Managing your power and directing it to the component (M /R or T/R) that needs it the most may well save your skin.
How about when your staggering out of a confined area, and you are running out of T/R....you miss read the wind a bit and now it feels like it wants to swap ends.
Your longlining and the load isnt quite clearing the top of the trees due to lack of power (ya ya get a bigger helicoper I know...dream on) ....exchanging a bit of a bit of pedal to put more power to the blades at times just be enough to get you up the extra few feet. Now you are controling yaw with the collective. If you are power limited you may be controling RPM with pedal.
My point is that learning to deal with T/R issues is a vital skill set that will help pilots in more ways than the obvious!