Hopefully not to derail the thread too much, I made this a seperate post to discuss the individual concepts behind certain mechanics.
In this case speech as a mechanical attributes. Keeping in mind the whole system is designed to be plug and play (and this this isn't essential) I figured I'd give a brief rundown on my views on the matter.
I view roleplaying as all encompassing in the behaviour of the character. Fighting with a sword is part of roleplaying, speaking is roleplaying, choosing not to speak or not to fight is also roleplaying.
Now in one of my long time game groups, a player is a semi-pro Mixed Martial Artist. He can fully describe how he would react and defeat any humanoid opponent in combat. I do not allow him to "Talk his way through conflict"
Thus for another player with a sales background who minored in Psych, I would think it equally unfair to let them "talk their way through a conflict".
Instead I use player descriptions as what they are trying to do, and the die rolls indicate what they actually do. I may try and remain calm to the screaming town guard and explain my story, but perhaps my low intelligece low social skills warrior can't control his temper and flares up. Obviously no one WANTS to get irrational in an arguement, but it happens as sure as no one WANT to fail to dodge the blast of dragons breath, but it still happens.
Thus I allow a crude player with a charming character the chance that his insticts clean up his speech or that it at least comes off as a humourous charming statement, likewise an elequent speech by thog the brain damaged cave dwarf may come out awkward, with missed words, sweating and stuttering and other poor presentation skills.
That isn't to say everything has to be rolled out, I don't make an attack roll be required if a princess slaps a crude ruffian nor a speech mechanic be used to idle small talk.
But if a warrior is trying to take down a twenty tonne flying super-intelligent dinosaur wizard that breathes fire (ie a dragon) with a pointy stick..I require a roll.
And if a bard is trying to convince the emperor that only those of average or above intelligence can see his "fancy new clothes" I will likewise require a roll.
That is just a gaming style preference though.