This is my Horse Throwing build
Level 30 (4 420 577 xp)
    * Strength: 15
    * Agility: 21
    * Hit points: 50
    * Converted: 2
    * Ironflesh: 0
    * Power Strike: 5
    * Shield: 3
    * Athletics: 5
    * Riding: 5
    * Horse Archery: 3
    * Power Draw: 0
    * Power Throw: 5
    * Weapon Master: 3
    * One Handed: 1
    * Two Handed: 1
    * Polearm: 99
    * Archery: 1
    * Crossbow: 1
    * Throwing: 100
Level 30 (4 420 577 xp)
    * Strength: 15
    * Agility: 21
    * Hit points: 60
    * Converted: 2
    * Ironflesh: 5
    * Power Strike: 5
    * Shield: 1
    * Athletics: 7
    * Riding: 0
    * Horse Archery: 0
    * Power Draw: 0
    * Power Throw: 5
    * Weapon Master: 6
    * One Handed: 1
    * Two Handed: 105
    * Polearm: 1
    * Archery: 1
    * Crossbow: 1
    * Throwing: 131
So I say go for it. Power Throw 5 is very good with Javelins, and daggers should be great against light armor. Good luck amigo!