Extend AR#save with :callback => false

Real world usecase:

User
- belongs_to project

Project
- has_many :users

class User < ActiveRecord::Base 
 before_create :update_project_user_action

 def update_project_user_action
   project.user_action_date = Date.today
   project.save :validate => false
 end
end

If I come back a month later or a fellow developer adds some callbacks on Project or validations then my call might fail. My callback does not care about the Project overall state, just the specific field.

It could also be argued that #update_attribute should also be given this property. Currently it skips validations but not callbacks.