You are going to be most effective before combat starts.
Once combat starts, the speech limitations really put a damper on you.
However before combat, you are super effective especially if you keep yourself and your actions mundane and small.
Consider this:
You are hired to get into a small office building and swipe some files from a computer. You know there are two security guards at the front desk and ten employees in the building. The File is on the bosses' computer.
You and your team walk in the front door, dressed as businessmen, approach the security desk. You use your abilites and etiquette:
■"Hello, we are here for our noon appointment, which you can check and verify AFTER your lunch. But could you please ring us through now so we can wait in the conference room?"
● you have presented yourself (expected), you have pointed out your intent (expected), you have planted a suggestion, AND an action (but both are not unusual to a guard. Lunch breaks DO happen. And he does buzz people through.... however after checking usually).
Something as simple as this gets you past the guards.
■In the office Space proper you see the secretary at her desk that you need to get past in get to the bosses office. So you approach the desk. "Hello, we are Mr. Smith's noon appointment. He mentioned he wanted you to go pick up some Sushi from Mr.RoboSushi on 4th and Edwards. We'll just wait for you and Mr.Smith in the conference room"
● Again, a little expected interaction, followed by a non hostile, and plausible suggestion/command can get you past the secretary without violence. (Never dismiss the secratary, especially if its a Troll!)
■ walking down the hall, you run into a couple of office workers... "Hey guys, you all prepared for that office meeting in 5 minutes? Best get your notes!"
● while not the best, its something on the fly that shouldn't grab too much attention, nor send off too many warning bells.
●●●
And that's just a quick example of what you can do to avoid combat and play to your strengths. Paired with a Break and Entry team, an awakened Smooth Talker can really open doors and prevent fights before they happen by simple social and event engineering.