override foreign_key_lookups with checkbox or multiple selection

[beebek]

class Organization(db.Model):
    name = CharField()

    def __unicode__(self):
        return self.name


class Privilege(db.Model):
    name = CharField()

    def __unicode__(self):
        return self.name

class PrivilegeAdmin(ModelAdmin):
    columns = ('privilege_name')


class Role(db.Model):
    organization = ForeignKeyField(Organization)
    privilege = ForeignKeyField(Previlige)

class RoleAdmin(ModelAdmin):
    foreign_key_lookups = {'privilege': 'name'}

I am finding it difficulty to create a individual privilege for individual role. Instead is there a way so that the foreign_key_lookups can have multiple selection or checkbox.
e.g. role = admin, reporter, article_writer
privilege = menu1, menu2, menu3, menu4, menu5

Present setting will allow me to select each privilege at a time, requiring 5 individual 'save'.
Is there a way out to override the code.