Although not a "kiddie" console, I'm entertaining the idea of playing around with the "Game Wave". So far I found out that the system uses Lua as it's main programing language, but I think it's using a customized version of it (at least it fails the header check when I attempt to run the software via lua on a computer.)
That said, it looks like it's fairly easy to customize the trivia games since all you would need to do is pretty much replace the MPEG-2 files. Then again, I'm not sure if the system does any form of CRC checking or can read a DVD-R. Oh, it would be nice to figure out what format the actual graphic files are in too, otherwise you wouldn't be able to do things like change the categories, etc.
That said, I'm not sure I want to bother with it all that much.