game-editor.com

I would like the ability to be able to direct graphics, sound, and script files to external editors.

I will second that notion. Though the in-program text editor fills its purpose, I find myself often using the Save/Load options to output the text to a file to manipulate it in some sense (usually switching around "if else" conditions) with my preferred editor emacs, then loading it back into GE to use in the Script Editor function.

You're thoughts of linking to programs to edit graphic and audio files is the next logical, evolutionary step.

Just for the record - I don't consider this as important a feature since the script editor has been improved.