Implement a webmail configure

In Ubuntu's Preferred applications app, you can choose which installed mail reader to use. This is the application that will launch when a mailto: link is clicked.
However, a lot of (most?) people prefer webmail over Evolution or Thunderbird.
It is not at all clear to the average user how to set this up, which is why I think this would make a great addition to Ubuntu Tweak.

Tweak could have a dropdown list containing the usual installed mail applications but with webmail clients (Gmail, Hotmail, Yahoo! Mail, AOL Mail) added to the list.

It would then have to change the following key in gconf: /apps/desktop/gnome/url-handlers/mailto/command to: /path/to/script/mailto.sh "%s"
while changing /apps/desktop/gnome/url-handlers/mailto/enabled to true and /apps/desktop/gnome/url-handlers/mailto/needs_terminal to false.

The scripts are the following:

Gmail:
#!/bin/bash
xdg-open "https://mail.google.com/mail?view=cm&tf=0&to=`echo "$1" | sed -e 's/mailto:\([^?]*\).*/\1/'`"

Hotmail:
#!/bin/bash
xdg-open "http://www.hotmail.msn.com/secure/start?action=compose&to=`echo "$1" | sed -e 's/mailto:\([^?]*\).*/\1/'`"

Yahoo! Mail:
#!/bin/bash
xdg-open "http://compose.mail.yahoo.com/?To=`echo "$1" | sed -e 's/mailto:\([^?]*\).*/\1/'`"

AOL Mail:
#!/bin/bash
xdg-open "http://webmail.aol.com/25045/aol/en-us/Mail/compose-message.aspx?to=`echo "$1" | sed -e 's/mailto:\([^?]*\).*/\1/'`"