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
This is also a very dangerous agi foot thrower build as it is, even more so with a couple of changes :
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!