Last year, we added support for the ability to manage bid adjustments by device type using the API. We are now relaxing the constraint for desktop bid adjustments. As this announcement explains, you can now set the bid modifier for desktop to anywhere within the range -100% to +900%. Prior to this change the supported values for desktop were 0% to +900%.
Now you can customize desktop bids the same way as other device types i.e., tablets and smartphones. It is now available in both the Campaign Management and Bulk APIs (v10 and v11).
If you have any questions in this regard, feel free to let us know your feedback at firstname.lastname@example.org.