Bukkit

It would be possible to add a system to specify gaining by level?. It is really easy to see what I mean with an example. Just something like:

Jobs:
  MyJob:
      ....
   Break:
      LOG:
        income: 2.0
        experience: 2.0
        level: 50
      STONE:
        income: 2.0
        experience: 2.0

In this example you would gain for STONE breaking but until you reach level 50 on that job you are not gaining for LOG breaking.

You would either have to restrict which blocks they can break, or have the player join a new job.