`inhibit-point-motion-hooks' isn't configurable

[Chris Moore]

In a regular *shell* buffer, I see that C-a doesn't go to the beginning of a 
line like it does in other buffers.  I explore this by describing the key 
binding.  I see that:
  C-a runs the command move-beginning-of-line
and:
  To ignore intangibility, bind `inhibit-point-motion-hooks' to t.

That sounds like it might be what I want to do, so I click on the link
to see the docs for inhibit-point-motion-hooks.  To my surprise,
there's no "you can customize this variable" link, and since I'm so
used to being mollycoddled by Emacs, I don't know how to customize it
manually.

I think we need to decide whether to mention this variable and make it
customizable, or not mention it at all.  As it stands, the new user is
left with a variable which they can discover but not change.

In GNU Emacs 22.0.96.2 (i686-pc-linux-gnu, GTK+ Version 2.8.20)
 of 2007-03-20 on trpaslik
Windowing system distributor `The X.Org Foundation', version 11.0.70101000
configured using `configure  '--with-gtk' '--prefix' '/usr/local' '--with-xpm' 
'--with-jpeg' '--with-png' '--with-gif''