Allow "Delay enforcement" according to grace period in New-CMSoftwareUpdateAutoDeploymentRule
allow setting "delay enforcement of this deployment according to user preferences, up to the grace period defined in client settings" check box via New-CMSoftwareUpdateAutoDeploymentRule
Support for this was added into 1906 with new SoftDeadlineEnabled parameter.
Aaron Flaugh commented
Expose -SoftDeadlineEnable to Set-CMSoftwareUpdateDeployment -SoftDeadlineEnabled
Its on Get-CMSoftwareUpdateDeployment not Set.