UPDATE* 09/08/2013 - AudioLabel 5.00 (Build 7) now includes the Canon MG5460 Direct CD Printer template, so there is no need to use the Canon Pixma MG5450 template.
You can print directly on the disc using the Canon MG5460 printer by selecting the "Canon Pixma MG5450" template in the "Change Label Template" dialog of AudioLabel (these printers use the exact same template). This template works with all Canon printers that have the letter "J" marked on the plastic disc printer tray. We will be adding the Canon MG5460 to the list of disc printers in the next release of AudioLabel.
For Direct Disc printing to work, it's important that the print driver properties are set correctly. When you go to "Print" in AudioLabel, click the "Properties" button, and then the "Print Driver Properties" button under CD Printer Settings. This will open the actual Canon print driver settings. From here you need to set the "Media Type", "Printer Paper Size", and "Paper Source".
Media Type = "Printable disc (recommended)"
Paper Size = "Disc tray j"
Paper Source = "Disc tray"
It's recommended that you always test print on a scrap disc before using the real deal. To get good alignment, print out a blank white disc design (with no pictures, text, or color), and make sure the "Print Borders" option is turned on when printing. This will print a black line exactly where the edges of the disc are.
Since the surface area of an ink jet printable disc varies by brand/model, it might be necessary to make adjustments to template dimensions (by clicking the "Edit Dimensions" button).
Please let me know if you have any other questions.