Custom lookup feature?

[Pediatra]

I would like to request support for custom lookups in, similar to Django's implementation.

@fields.CharField.register_lookup
class MyCustomLookup(Lookup):
    lookup_name = 'my_custom'

    def as_sql(self, compiler, connection):
        lhs, lhs_params = compiler.compile(self.lhs)
        rhs, rhs_params = compiler.compile(self.rhs)
        params = lhs_params + rhs_params
        return '%s MY_OPERATOR %s' % (lhs, rhs), params

Model.filter(name__my_custom='test')