Compared to standard mod_custom it has the following features:
* No filtering (even for script tags);
* Override module position chrome to remove unwanted wrapping HTML code around the module;
* Add custom CSS code into HTML header for pages where the module is enabled.
Especially useful for:
* Advertisement code (such as AdSense or adBrite);
Thank you very much for your feedback!
The parameter you mention wasn't designed to accept file names or link tag, it was accepting style information.
Since you and other people might need to reference an already existing .css file, additional parameter was added for that in 2.0.
Thanks so much!