[O] installation questions

[Yagnesh Raghava Yakkala]

Greetings!!

I run "make oldorg" to generate org-install.el and have following in my init
file, everything is working fine(I believe).

     (require 'org-install)
     
I have few questions about installation procedure though. 

1. Is the above snippet is all that is needed to load org.? 
   suppose I want to use org-inlinetask.el, It seems I need to have

      (require 'org-inlinetask)
      or
      (add-to-list 'org-modules 'org-inlinetask)
 
   or is there better way.? 
 
   IMO org-modules variable can be documented in the installation section[1]
   for better visibility.
 
2. I see few interactive functions are present in source files(for eg.,
   org-inlinetask-promote) with no autoload cookies and thus not generated in
   org-install.el.  I thought its good idea to put autoload cookie for every
   interactive function. what is the rationale for autoload cookies in emacs.?

   I am asking this because if those functions have autoload(ed) I wouldn't
   (probably) need extra configuration in my init file.
   
3. why is contrib folder not byte compiled with make.? It seems there is no
   argument for make to do this.
  

Thanks.,
   
Footnotes: 
[1]  http://orgmode.org/manual/Installation.html#Installation

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YYR