It is very hard to hold a gifted kid back. We have been trying to slow down DS4 because of his emotional maturity, well not exactly. To us he is actually more mature for his age, always tries to be good kid, actually extra hard but that just isn't enough at school. Things like being adamant at times and interrupting are the issues we are facing now.
He is reading like a champ, I would say at second, third grade level, started doing multiplication on his own and many other things and this is when we are trying him to slow down, scares me like hell.