The following descriptions are all theoretical. I can't guarantee that any of the following will actually work, be legal, or not destroy your cRio. try it out at your own risk
The Axis camera that came with the KoP is a network camera - basically, you stick it on a network, and use software to access it via IP address. All in all, it's a pretty simple device to use.
That being said, if you wanted to connect two of them up to the cRio, you see the immediate problem - you only have 1 port to plug them into. To solve that, you would need a hub. Tons of companies make them, with a wide range of ports. I have one similar to this at home, extending my network to include various gaming and media centers:
http://www.radioshack.com/product/in...&tab=techSpecs
Power requirements are 12V, 1A.
With that, you can, in theory, hook up 4 cameras to the single cRio port.
Once you get it hooked up, assuming no magic smoke comes out of components and everything can safely coexist, you have the daunting task of actually connecting to them and using it in your code. Yikes! The camera code would essentially be duplicated for each camera hooked up to it, and configured to connect to a different IP address for each camera. In theory, that is. I haven't looked at the provided code, so i can't say for certainty.
So, if we assume that things were created and designed to be flexible and extensible, as all things should be, we can probably say that it is theoretically possible. Now, it might bog down the PPC in the cRio, but you'll never know until someone tries.