How can I set alternate ranking conditions?
For example to get VIP, I need to either:

• kill 10 pigs
  or
• walk 10k blocks

On the same idea:
From Member, I can either

• kill 10 cows and get upgraded to Farmer rank
  or
• hold 3 stacks of wood logs and get upgraded to Forester rank

You can give the individual requirements rank changes or upgrade commands. Take a look at the super advanced config on the wiki.