new printer borderless printing problem

I recently bought a Canon Pixma iP4000 to replace my old Canon i950 that was broken.

I know the procedure for borderless printing, but the new printer does not have 4x6 as a paper option. It has somethign called "Hagaki" which comes close by leaves a white strip down the side. There is a customize option but this always leaves a border, no matter how I set it up.

Anyone have experience with this printer? How do I get 4x6 as a paper option?

thanks

tony