Almost certainly a hard no, but I've seen it several places, and it looks like alot of fun...
Rapier Wit (3.5e Feat) [General]
Your tongue strikes keener than any blade and your words cut deep.
Prerequisite: Charisma 17+
Benefit: You use your Charisma bonus instead of your Strength bonus for the purposes of determining Attack rolls ONLY with a Rapier.
Normal: Add Strength to Attack rolls.
Kind of useless unless you make Charisma your focus, but I could imagine some interesting builds with Bards, Paladins/BG, Hexblades, Warlocks and even Sorcerors...
Clerics and Favored Souls as well...
A bit like Weapon Finesse or Zen Archery, but for Charisma, and for Rapiers only.
Just throwing it out there...