i know there's alot of hype over the command blocks. i want to do a specific thing with them. i want to be able to change the block that when water and lava collide instead of it being cobblestone i want it to be like a lucky block mod and change blocks everytime
I think he means he wants it so that when flowing lava and flowing water flow into the same block, instead of creating a block of cobblestone, it either creates any random block, or any block of their choosing which they program through command blocks.
It can and has been done on PC - as well as command block programs that allow you to make your own working in-game recipes - but I doubt we'll be seeing it on the Xbox 360. There's a lot of entering text into command blocks which runs the issue of constantly opening and closing text-entry windows on the console, and is one of the main reasons why 4J have said we're not going to be getting books and quills.
I understand that you can plug in a USB keyboard, or use the plug-n-play keyboard that connects to the controller, but for people who don't, adding command blocks and books and quills might be seen as a waste of time.
That's why I've been working on a GUI layout (as a suggestion) for command blocks for consoles here: