This is how I managed to make a “directional gradient along a path” with illustrator CS5.
It looks like this is solved with Illustrator CS6. Check out the following video.
Note that the file is a .psd. You have to open it with Photoshop and double click the “vector smart object” to edit it with Illustrator.
Please feel free to download it.
Enter your email to get the freebie now!
Simply enter your email address and the download link will be sent right to your inbox.