The basic idea seems kind of bad, mostly because there are easier ways to increase specilities.
But I've been working on one of my own, though I was going to suggest this later on, when more things are available.
Maybe it could be put in when more Mangekyou moves are shown.
You'll get a random teacher who will teach you a move.
Kakashi will teach his unnamed move.
Itachi will teach Susano.
Sasuke and Madara both have something that they can do, though neither is in.
Perhaps the same could be done for the other KGs, when more moves are revealed, without Neji having to mess with them more, such as if Gai opens the 7th or 8th gate, Neji uses even more Juken moves, ect. Before learning them, they can't be used, no matter how many specility points you have, while even resetting won't get rid of them once learned.