Use Dell OMCI. With it you can script changes to the BIOS.
Dell™ OpenManage™ Client Instrumentation (OMCI) is available on Dell
OptiPlex™, Dell Precision™, and Dell Latitude™ client systems. Using
OMCI, system administrators can remotely manage assets, monitor system
health, and inventory deployed systems in the enterprise.
OMCI interfaces with leading enterprise management consoles that
support industry standards. This approach helps to ensure that Dell
systems can be managed by a broad array of existing enterprise
management tools. OMCI also interfaces with Dell OpenManage products
such as IT Assistant and OpenManage Client Connector. Finally, tight
integration with Windows Management Instrumentation (WMI) allows
customers to take advantage of the rich scripting capabilities for
collecting information and customizing system settings. OMCI is
provided at no additional charge to Dell customers.