I recently released a Premium version of Custom PHP Settings which comes with extended features such as:
Add environment variables, this is only doable if you are running PHP in non-cgi mode.
Display extended information for you Wordpress environment including settings for database, wordpress and GD library.
Support to add unlimited named configurations.
Remove any existing settings from the configuration file on demand.
Top level plugin menu.
If the above seems interesting, please buy me 3 beers to get a Pro license.
Thank you for you support!