Do you expect a player to actually role play at all then or just say casually "I use my diplomacy skill to calm down the angry inn keeper" then throw some dice?
No, I expect them to roleplay, and then they'll throw some dice. The result of the die roll combines with the quality of the roleplay to determine success or failure. Make a reasonable and convincing proposal, and a good Diplomacy check will get you what you want, while a bad check means the other party politely declines but is open to further discussion. Make an unreasonable, insulting proposal, and your Diplomacy check is to keep the other party from walking away, punching you in the face, or demanding satisfaction at swordpoint.
The point is, I'm already factoring your Charisma into NPC reactions, by way of the Diplomacy check. I don't require you to factor it into your roleplaying as well. Your Intelligence is factored into your knowledge checks and your Wisdom is factored into your perception/insight. Beyond that, you play your character however you dang well please. If you're not doing a good job portraying the concept in your head, you're the one who suffers for it. The rest of us will just conclude, "Bob the Dwarf is a heck of a speechwriter but his delivery's not so hot," and move on.
If you want to use your stats as a roleplay hook, by all means do so; however, trying to make people "roleplay their stats" just leads to problems IME, because the books offer hardly any guidance on what any given stat means. At what point does the Sun Tzu of the local wargaming scene have to start dumbing down his tactics? Intelligence 8? 10? 12? 15? How persuasive are you allowed to be with Charisma 13? It's like adjudicating the paladin code, only without the well-defined rules and strong community consensus on what constitutes inappropriate actions*. In practice, I find it ends up being, "If you put a 9 in your mental stats, people will hassle you for doing anything smart, thoughtful, or polite. If you put a 10 in, you have carte blanche to do whatever you like."
[size=-2]*Yes, I'm being facetious.[/size]
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