Edit Link Text "Email this page" ?

Me too!

One way is to manually render the links in your template yourself.

1. Uncheck all these options: Show Forward on teasers, Show Forward on comments, Show Forward on non-node pages
2. Wherever you want the forward link to appear, manually create the link:
i.e. /forward/$variables['nid']

Changed to feature request

I suggest changing the checkbox...

Use Node Type in Link
If checked, the link will read "email this nodetype"; if not, it will just read "email this page"

...to something more useful, like a textfield for the link text, with %nodetype as an available variable

Try the String Overrides module: http://drupal.org/project/stringoverrides

As per http://drupal.org/node/320554, the format has changed to:

Problem
My old links http://example.com/forward/80 would not work.

Solution
Update links from http://example.com/forward/80 to http://example.com/forward?path=node/80