I will have my backup camera directly input to my Lilliput..
BUT, I would also love to ba able to click a button etc .. and have 1-4 cameras (all USB ) automatically record as one. Like having each take up 1/4 the screen, kind of like surveilance cameras. I know there are video capture cards that do this with standard video (rca) inputs, but as far as USB I don't know.
You ask yourself, why in the hell would you want that ???
Well, if/when I get pulled over by Johhny Law, all 4 cameras will record all actions and audio for future evidence of harrasment. Unknown to officer of course