economy

So I have been trying to figure out a way to give users the ability to vote a certain number of times per week, vote a certain number of times per node and such all based on rank.
I.E.
Privates can vote 3 times per week, and vote once on each node.
Sergeants can vote 9 times per week, and apply two votes per node etc...
If possible it would be nice to have the usable votes left accountable, such as the private being able to bank up 9 votes adn the sergeant banking up 12 votes etc..
I found this topic where wordfallz thinks rules can be used to accomplish this. Question is how?