Hey, welcome to PPG, shawne! No half-orc race, because that would require a new character with a completely different story(shrek-like, probably; and I can't write that well).
Or you could go completely off the wall and make a caster Half-Orc. yes, they usually are not, but he has his story to tell, so.
As for the kits, I think I've included some of the kits for the IWD-in-BG2 option - Cavalier for Holvir, Archer for Korin, sorcerer for Severn(convenience only, he's still a bard) and so on.
I am pretty sure I took this off from somewhere here, or the ReadMe:
Holvir, paladin; alternate class: cavalier, inquisitor, undead hunter
Korin, ranger; alternate class: archer, beast master, stalker, multiclass cleric/ranger
Nella, fighter, possible dual-class - cleric, druid; alternate class: berserker, kensai, wizard slayer, monk, multiclass fighter/cleric, multiclass fighter/druid
Severn, bard; alternate class: blade, jester, skald, mage, sorcerer, wild mage, multiclass fighter/mage
Teri, multiclass fighter/thief; alternate class: thief, assassin, bounty hunter, swashbuckler, multiclass mage/thief, multiclass fighter/mage/thief .
The only thing I would like you to add is to make it possibility for me to install Nella as a Cleric, and perhaps as a Druid. See, had to do it by hand...