I would volunteer for a tuesday-saturday shift for peak season. This way we gain a saturday of residential deliveries. I would suspect on a saturday a driver would be able to do more stops per hour then a regular business day do to less traffic. Also it would help in getting those pesky time consuming signature required send-again packages out of the system. We get slammed with cases of wine and all kinds of signature required packages during peak.
If nothing else, use some of the seasonal hires for a tuesday-saturday shift. Lessons the chance of an accident. Keeps them in the residential sections. Less chance of the screwing up commercial stops and pickups. Probably more productive too.