Limiting Serialized Machines to Customer Dept only in Order Entry

When placing serialized supply orders for a customer with departments It would be nice if the only machines that populated in the assign system/serial number box were the machines that are located on that specific department only and not all of the machines listed for every dept under the main account. Yes, you can click the Limit by Exact Customer box, but I don't feel that you should have to click that every time you place a serialized supply order. It should automatically default to that option.