Does your son have an area of the house that is not carpeted, maybe tile floor somewhere?  If so, could he gate off that area and use potty pads, while he is gone during the day?  I'm thinking of Samantha and her being crated for 8+ hours every day.  Even if it is just during this potty training phase, that could go on for months, and that is a lot of hours to be crated.  Especially if she is then crated again at night, she would be spending 16+ hours crated every day
