I dont get the rate/grade part of the idea.
So you decide your squad co should be mission planer, he plans a perk mission, all squad members join, give him highest grade and then you quit the mission. Do that 20 times in a row and the squad co has a lot of mission perks.
Other way round, squad co has 10k perkies, he opens a squad mission with perk rides every squaddy graps one and can have a perk ride without paying for it.
Next way round, a seasond player is not intrested in perk planes, he sells em for 200$ and opens a perk mission for the guy that pays.
It would be fun to have a 262 mission or the like, but the potential missuse should be ruled out and the rules still be simple. Either i dont understand what you want to do or it has some flaws.
Finally, i dont see why i should give a mission planer from my own country anything else but the best rating if it helps him.