I have a SG with a LP rating of 2... obviously I don't want him practicing his LP moves, is it reccommended to put it at 0? or at least 5 or something?

Well, two things:  Does he have high potential in LP. . .and does he have anything else at all that isn't a two that can improve?  If everything else is tapped out and he has high potential there, go to town, if not, I'd leave it at zero - the worst it would do is lose one.

Yeah i wouldn't recommend putting time in there unless you've maxed out his other ratings. Even with 20 practice minutes he would probably be lucky to see his LP rating go up to 5 or 6 after an entire season. (Depending on WE of course). Improvement is very slow that far down on the spectrum. Guys usually start seeing better gains once they reach about 12 or 13 in a category.

put him at zero