I don't know if anything is "standard" in 10 X 10.
We run 2 utility spots in 7 X 7 and it blows goats when coupled with Yahoo's eligibility rules. No position scarcity at all, really lets the weakest owners keep up.
It varies so much from league to league. I've been in leagues with 3-4 UTIL spots and others with none. I prefer to play with no more than 1 UTIL spot myself. Along with also playing with outfield specific postions RF, CF, LF instead of just simply OF.