User friendly timezones as an option.

Great module. An absolute necessity on any site I develop. Recently I found myself writing a hook_form_alter again to replace the options in the timezone select list with US timezones (i.e. "EST" instead of "America/New_York") and I thought that would be a nice add-on module to the package.

My vision is:

• User enables the module and has the option to "Use U.S. Timezones Only" on the CCK field creation form.
• Select list in all instances and any user output with regard to timezone (e.g. the profile) is then replaced with the US equivalent to the timezones in the list.

My reason for posting was to ask kindly what your recommendation would be, as the maintainer, for where it would be "easiest" too hook in to that data?

I'm happy to code and maintain this module and just wanted to get your opinion on this since it's technically a feature dependent on this module.