Different options for STI models

Quick question: is it possible to have different acts_as_tree options for subclasses of a STI model? Specifically, can we do this:

``` ruby
def Person
  acts_as_tree
end

def Person::Teacher < Person
  acts_as_tree :order => 'age'
end

def Person::Student < Person
  acts_as_tree :order => 'name'
end
```

In this example, each teacher, ordered by age, has children ordered by name.
