Col Com Dante's page

Maybe some maps, telescope a compass and such to spot the easiest routes between places, the most defensible camp positions and the like. With a higher profession skill you become better officer material. Or could even be used to represent training that makes giving out complex instructions take less time, with less margin of error.

I used a Pistolero in ROTR and absolutely dominated every single combat. Reloading is a total non issue if someone in the party can cast extended abundant ammunition, and two pistols will kick out serious damage.
I was using +3 Flaming, Cold, Acid, Electric Seeking pistols, one in each hand, but the ridiculous initiative bonuses, combined with 7 attacks each round combined with clustered shot to more or less ignore DR means gunslingers can kick out incredible damage up close, usually killing enemies before their turn.
For utility, you need the rest of the party, Gunslingers have no utility outside of murder. But in terms of outright damage, nothing else i've played as had such a consistently high damage output.
Damage output/turn = 21 + 7d8 + 7xDex(7 in this case) + 7d6 fire +7d6 acid +7d6 cold +7d6 electric. You do need to make an absolute mass of rolls though. The odds of you missing at high levels in close range are slim, hence assuming all 7 shots hit.

As I'm currently playing the 3.5e prestige class Fiend of Corruption, this topic has been discussed at great length in our group. The conclusions we've reached are

1. I may not deliberately injure, inflict disease or torture the subject into signing my proffered contract, not use other party members to do the same.
2. I may not use Dominate Person, Command, Geas or other mind affecting spells/sla to get a signature, with the exception of Charm Person.
3. I can withdraw my favor (+3 to an attribute, -6 if i withdraw it) and use the stat penalty to encourage the subject.
4. I can bribe, lie and blackmail mortals into committing progressively more evil acts until signing is the only way out for them.
5. I can lie about the details of the contract as much as i want. If they can't read an 18 page document in Infernal, and pass several opposed profession: Barrister checks, too bad.

That being said, I'm mostly focusing on one other PC, by offering various bonuses (wings, reach etc) in exchange for her committing increasingly evil acts until the offer of the half-fiend template and/or immortality in exchange for her soul seems reasonable.
Oh, and I'm currently the only Evil PC in the group, and despite that I've made no secret of the fact I'm playing an Imp, all bar one party member trusts me.