Can you add the icode button to the Quick Reply? I tend to use it (as previously mentioned ad nauseum :icon_razz:) for anything in which fixed font helps text stand out better. In fact, I probably use it more than code tags. I would find the button link handy.
Another approach might be to go with the [tt][/tt] ("teletype" I believe is what it was elseweb) shorthand. But I guess that was already rejected. :'(