@ Neil Im a half-life modder myself i know a bit about half life mods. what they could do is make it so pc half-life 2 mods work on the xbox and getting the mod to the box would be easy ad keyboard support and type in a mods location on the internet e.g www.half-life2mods.com/cs.zip and in that zip would be JUST the mod it would have to be formatted to work for instince in the zip there is folder called cs in that folder you have models ,sounds ,client ,dlls ,shell ,gfx etc...
bTw im in the frog mod im the coder and modeler