Seems like a fairly good idea. I have always wanted to see a point based system for the frag list. Back in the day you would get different amounts of experienced based on the level of the person who died near you. You got a bit more for killing of course but it was still based on the level of the opponent. I think the point system needs to have a bit more of a complicated formula for it. You need to have more of a sliding reward system. If you do damage to a person of similar level to you, you should receive an average amount of points per point of damage you do to the player. If the player is lower level than you, you will get less points per point of damage and more points per point if they are higher than you.
So if a level 1 peasant runs up to a level 32 veteran player, one could argue that he is taking a much higher risk than if he were to go for a lower level player. Thus he would be rewarded proportionally to the risk he took.
That's my thoughts on it. I can clear up a few questions about the damage system. You can track the amount of damage a player does fairly easily. You can see if a horse is mounted when it was hit fairly easily. I was working on a mod a while ago and spent much of my time learning the limitations and capabilities of the modding system.