The model I used had her toes slightly off the floor. I wouldn't bother with it so much considering it's for Brawl Mods. But if it bothers you that much, that should be an issue that should be dealt with before you start rigging... lol...
As far as the Foot Pivots go...
Heel
Tip Toe
"Heet"Pivot
Toe Pivot
Just think of the way you wanna move the characters feet. I just listed some of the basic ones.