Please contact me email drichard at largo.com or dave_largo on the IRC if you might be interested in a minor bounty project. Apparently the Layout Slides in OpenOffice Impress are hard coded into the source. An example of adding another slide is displayed on this issue. We would like to add 2 more slides. One that is a 2x2 grid to hold photos, and the other which is 3x2. I have circled them in the mockup below. I would create the issue on openoffice.org, you would attach the patch. It would be my job to get it accepted and merged.