Bare Metal Deployment (post deployment automation)
It would be nice if there was a good way to inject execution of custom scripts or either a way to trigger MDT (and\or SCCM) task sequence (with a support of TS initiated reboot) as a final deployment step once the host got all the needed settings from SCVMM but before it become available for placement. This step is needed to automate installation of vendor specific drivers/tools (and other software) that for whatever reason cannot be injected into the template VHDX. Currently, the workaround is to use the GUIRunOnce attribute together with auto logon in the unattend.xml file, but that's not always reliable and there's no way to know for sure if the host configuration is finished and whether it's safe to initiate post deployment activities.
Jaromir Kaspar commented
Yeah, just running package would be great - deploying software such as sccm agent, scom agent, antimalware...