Eric Clingenpeel
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In 3.5 Far Shot used to do this. Projectile weapons increased range by 50%, while thrown weapons' ranges were doubled.
Pathfinder changed this to halving the penalty for throwing beyond the first range.
There are two exotic weapons the Flask Thrower and the Launching Crossbow.
The Flask Thrower is a modified sling staff that can be used with splash weapons, giving them a range of 20'. This was in Gnomes of Golarion.
The Launching Crossbow is a modified crossbow that again gives splash weapons a 20' range, however this specifies as taking a full round to load like a heavy crossbow. This was in Adventurer's Armory
ProfPotts
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There's the Strong Arm, Supple Wrist combat Trait in the Qadira book (page 9).
The Greater Hurling rage power (APG page 76) helps, but it's Barbarian-specific with a level 12 pre-requisite.
You may, of course, be thinking of the Splash Weapon Mastery Feat from the Adventurer's Armory (page 31) which counts as Far Shot for splash weapons only (amongst the other stuff it does).