Melee and Ranged Weapons: Melee weapons are used for making melee attacks, though some of them can be thrown as well. Ranged weapons are thrown weapons or projectile weapons that are not effective in melee.
Thrown Weapons: Daggers, clubs, shortspears, spears, darts, javelins, throwing axes, light hammers, tridents, shuriken, and nets are thrown weapons. The wielder applies his or her Strength modifier to damage dealt by thrown weapons (except for splash weapons). It is possible to throw a weapon that isn’t designed to be thrown (that is, a melee weapon that doesn’t have a numeric entry in the Range Increment column on Table: Weapons), but a character who does so takes a –4 penalty on the attack roll. Throwing a light or one-handed weapon is a standard action, while throwing a two-handed weapon is a full-round action. Regardless of the type of weapon, such an attack scores a threat only on a natural roll of 20 and deals double damage on a critical hit. Such a weapon has a range increment of 10 feet.
It is possible to throw a weapon that isn’t designed to be thrown (that is, a melee weapon that doesn’t have a numeric entry in the Range Increment column on Table: Weapons)
ghearus said:This sentence really clarifies the difference between a thrown and melee weapon.
As a DM I would rule that if a weapon has a range increment listed in its source, it is designed as a thrown weapon, otherwise it is not; for clarity, this does not apply to projectile weapons.
Under that ruling, unless a melee weapon gains a range increment through magic, or by feat, the +1 bonus would only apply to weapons that are designed to be thrown.
Throwing and slinging stones is a universal sport among halflings, and they develop especially good aim.