Plugin Request - "Buy" Permission- Nodes

I have some plugins on my server that do cool stuff. My players aren't allowed to use them, because we're making a survival- phase right now. Before, they were able to use all of them.
Everybody keeps asking me to allow a specific thing again. I'm tired to say no.
I thought a bit and had an idea: What if you could buy Permissions for things the admin can specify? For example, player A want's to have a lightning when he logs in, cost for that is 30 iConomy- Dollars. When he has enough money, he can buy that permissions by typing a command or even interact with a trader- npc. When he bought it, the Permission is added and Permissions is automatically reloaded. I think with Permissions 3.x that would be possible, right?
I would really appreciate it if a dev tries this.