I'm not sure I see any specific benefit to doing it other than 'bling', and to say that I did it. I can imagine that it would make a sound very similar to that of a timing gear set. Which may or may not introduce some kind of high frequency harmonic vibration. I can't imagine how healthy that may be for the heli since I am complete noob.
Thought it might be an interesting conversation idea.
But I do see your point crashcrash, in the fact that there is no real point to doing it.
Regards,
Casey