Possible? Yes
Difficult for anyone but tom? Yes
Customcod sucks? No, even though some parts may
Consoles better then PC? No, but more popular and fun to play
If I could put maps onto a console, would I? Yes
Edit:
Also, you can mod consoles. Which means, in theroy, you can put maps onto consoles. You couldn't just drag and drop from computer to a console, but you could rewrite your map for use with the console. Thread starter is wrong - you cant do anything if you put your mind to it. But in the computer world, it's pretty much just the opposite.