Class IP? Cooperation Incentives.

Riot is testing bonus IP for parties, and that got me thinking: what if there was a way to utilize IP to encourage people to try and discourage trolling? There are five team members, and five roles. My thought is that each role competes to do better than the same role on the other team, and the one that does the best gets some bonus IP, a 'class boost'. For example, if the supports are and , the one that performs the best gets the bonus, but neither is affected by how their respective ADC's do. The idea here is to encourage everyone to do their best, even if they think there is no way to win or if someone AFK's, gives up, or trolls. Each role would be judged by different criteria since they do different things: support is judged mainly by assists, mid by kills and farm, jungler by kills and assists, etc. The criteria can be worked out over time. Again, the bonus is unaffected by how your teammates do, you are only competing with the enemy player in the same role. The biggest problems with this idea lay in meta breaking. What if they duo top, or use a less-than-traditional champion in their role? Also, the game would need a system to determine that, for example, is competing for the mid bonus and not the support bonus. I like the direction of this idea but it could use refinement so I would really like to hear feedback/modifications/suggestions.