I have a question on this, for Mort and other GMs. Say I want to play a charismatic barbarian Fighter, an REH-Conan type, in a game like 4e which strongly penalises investing resources away from core competency, which for Fighter is STR-based fighting ability. I'm prepared to roleplay the PC as fairly charismatic - eg I'll put effort into coming up with good one-liners.
How much resources should I have to invest in interpersonal skills before you'll let my words stand?
Is CHA 12 enough? Anything more than that will really start to hurt my combat effectiveness.
Intimidate training is not a problem - can I apply that skill to a wide range of situations? Do I need to invest in getting Diplomacy before I can talk suavely? What if I have Diplomacy training + CHA 10?
I don't play 4E so I can't answer that for that edition but for 3E which I play I say the minimum for delivering really charismatic speeches is a 12. Once in a while is okay even a low chr character can get a speech right that strikes a chord now and then. Anyone can roll a natural 20 on a diplomacy check which in my games makes it a 30 so even if a person has a chr in the minuses they are still giving an excellent speech.
I don't understand this being so hard to understand if a player wants to be a good fighter for example he needs to allocate resources to make it so. Just because he gives a great description of what he does in battle does not negate the fact that he has to roll a dice to hit.
I have the same issue with players who are really good at tactics and strategy playing a very low intelligent and wisdom character yet at the same time having brilliant tactical ideas all the time.