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There's a possibility to add additional help sources in IDLE via
 Options -> Configure IDLE... -> General -> Additional Help Sources
Use case:
> If someone wants to download certain version of Python documentation in HTML and specify local "index.html" to be opened by custom menu item which appears the in Help menu.
Problem:
> It's not possible to assign custom hot-key (Options -> Configure IDLE... -> Keys) for such menu items or reassign <F1> to that new menu-item, which actually makes sense when talking in context of the use case specified above.
This use case was taken from real life (stackoverflow site):
http://stackoverflow.com/questions/12174255/linking-offline-documentation-to-idle-linux 

Actually, IDLE does have code to look for an on-disk copy of the html-formatted Python documentation set but the paths are platform-specific and, in the Linux case, are out-of-date for some distributions at least. For Linux platforms it looks for `index.html` in either `/var/www/html/python` or `/usr/share/doc/python-docs-x.y/Doc/`. On current Debian systems, for example, the Python doc package is installed in `/usr/share/doc/pythonx.y-doc/html`. If you install the doc packages and then create a link, IDLE should find the docs off-line when you select `Python Docs` from the `Help` manual. For example, for Python 3.3 you *could* do:
 sudo aptitude install python3.3-doc
 sudo mkdir -p /var/www/html/
 sudo ln -s /usr/share/doc/python3.3-doc/html python
That said, the default locations should be updated. And perhaps a more useful customization would be to add a user configuration option for where to look for the on-disk copy of the docs rather than adding another hot key. (Also, older versions of Python are in security fix mode only.)

Here's a patch to update the doc paths to include current ones for Debian/Ubuntu and Fedora. The patch will have to be tweaked a bit for 3.2/2.7 to change sys.base_prefix to sys.prefix.