To replace the character limit in the header area of the cart is quite easy.
Go to: http://www.malsforms.com/header2.js right click on the page and view the source. Copy the content and open a blank notepad or similar page and save the file in your root folder as header.js, upload the file. Obviously modify the content to suit your header requirements.
Next, in Mal's, go to the Logo and Header Message section and place the next line below:
You can view this example by going to: Dyepack