The "Holy Tactician" paladin archetype has something like what you describe - it weakens the bonuses from the normal smite in exchange for providing buffs to your allies' attack and damage rolls.
Cavalier/samurai challenges, and to a lesser extent inquisitor judgments, feel smite-ish but don't key off Cha.
There is a smite ability with the celestial template. You can play a druid and take planar wild shape and when you wild shape (into whatever) you have the celestial template and have a smiting ability 1/day. That smite is based off Cha. You will also get some DR, Spell resistance and some energy resistance and it levels up with you.
There is a smite ability with the celestial template. You can play a druid and take planar wild shape and when you wild shape (into whatever) you have the celestial template and have a smiting ability 1/day. That smite is based off Cha. You will also get some DR, Spell resistance and some energy resistance and it levels up with you.
