Just an idea I've had since I've been watching a lot of Doctor Who. He always seems to talk himself out of trouble, and I think it would be interesting if characters could try it.
Fast Talking: When characters encounter monsters, they can attempt to adjust the reaction roll. They must be able to speak to the monster in a language that it understands. Normal rules about whether the monster can even have a positive reaction apply (i.e. Fast Talking doesn't work on zombies, etc.).
If used, Fast Talking gives the character a +1 bonus to the Reaction Roll, in addition to their Charisma modifier.
Halflings, elves, and thieves gain an additional +1 modifier to the Reaction Roll (race and class do not stack).