Yes, you'll need quickdraw for any throwing build, unless you're using something like darts or shuriken.
Depending on what sources you have access to you'll want to look at Startoss Style as a feat, along with Point Blank Shot, Deadly Aim, and Precise Shot. Sliding Axe Throw can also be interesting if you have other, melee oriented part members.
Startoss Style can be fun for a pseudo-cleave effect, and the +2 damage per feat helps offset characters that don't have super high Strength. If you've got Weapon Training (or the Martial Focus feat), it lets you apply the abilities to anything you throw. Weapon Training also gives you access to Richochet Toss, which is way better than stuff like Returning because you can make full iteratives.
Startoss is absolute trash unless you play a monk, a brawler or a magus. Maybe a warpriest but not likely.
Everyone else is better off with TWF or Two-Handed Thrower.
Fighters with Weapon Training (or anyone with the Martial Focus feat) can pick up the Ricochet Toss feat to remove the need of a blinkback belt.
A spear thrower fighter is a good way to start.
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Also want a way to retrieve the weapon, so either the Returning enchantment, Blinkback Belt, or Ricochet Toss feat. Returning Enchantment is least desirable because it doesn't come back until your next turn, so you are unarmed until then.
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Other options include the Dagger of Doubling and the Sharding special ability.
The Returning Weapon Vigilante Talent is really nice. I think the Stalker Vigilante would make a good class for a thrown weapon build. I'd probably also take Hide in Plain Sight and Sniper for that.
It says that the duplicate "gains a 10' range increment" rather than "increases it's range increment by 10'" so I don't think you could add the two. I'm unclear to me whether the duplicate of a thrown weapon that normally has an increment larger than 10' would be able to use that larger increment or would be stuck with 10'. I suppose it would be GM call.
Startoss is absolute trash unless you play a monk, a brawler or a magus. Maybe a warpriest but not likely.
How do you figure that? It's certainly not the most optimal choice, but I think it can be decent for a number of classes besides those 3.
Fighters can make pretty good throwers, because they have easy access to both Ricochet Toss and Focused Weapon, as well as Weapon Training. If you got the full Startoss line and Gloves of Dueling, by level 10 you're looking at throwing a starknife/dagger/spear/whatever for 1d10+12 BEFORE factoring in Strength, Deadly Aim, magical abilities, etc.
Startoss Style (and the rest of the feat) is going to be fantastic for my fighter/stalwart defender.
Use Defensive Stance, a move action for Combat Advice or Bullseye Shot, then a Standard Action for a "full-attack" with Startoss Comet.
As DeathBySquirl said, the three Startoss feats plus Weapon Training/Dueling of Gloves plus Weapon Specialization and a chakram equals a lot of "area-of-effect" damage.
Combine that with a "high Dex", Improved Snap Shot, and Combat Reflexes?
That's a mean battlefield controller.
A pair of baldrics with daggers at the ready is always nice. I think each one makes something like 4(?) daggers readily available. Wrist sheathes, boot sheathes... concealed daggers... the Throw Anything feat, quick draw... ah, fun times.
