Furthermore, I saw that you directly added hooks at the end; referring
to the "Emacs Lisp Coding Conventions" at

http://www.gnu.org/software/emacs/elisp/html_node/Coding-Conventions.html
,----
| Simply loading a package should not change Emacs's editing
| behavior. Include a command or commands to enable and disable the
| feature, or to invoke it.
| 
| This convention is mandatory for any file that includes custom
| definitions. If fixing such a file to follow this convention requires an
| incompatible change, go ahead and make the incompatible change; don't
| postpone it. 
`----


You can simply wrap a function around the adding/removal of the hooks: