Windows Logo testing Warning for my driver

In "HKLM\Software\Microsoft\Driver Signing" is a value called "Policy". If 0, no warning. But on XP2, if you just try setting to 0 and try to install a driver (without booting), it will reset it back to old value. There are at least two places where it will be reset, so I figured I'd get around it with the old "RegNotifyChangeKeyValue" trick. No luck.

When you do it manually from the control panel, it is apparently also storing it in SAM (witnessed by the immediate update of the setup hash). I *know* there has to be a way to automate this.

I know I could probably just jack SigTab.dll or SysADM.cpl (DriverSigningDialog) but that seems like a serious cludge just to install a driver without the fuss (not to mention probably OS version specific).

Open to suggestions...