I have looked through docs a few times, and my google foo is also failing me on this one.
I have a number of post template creation steps I need to do and would like to be able to leave the template as a VM, not VM Template. This simplifies automating the next steps - some image validation, and publishing template to a VM content library as a VM not OVA (I have a network of content library subscribers that all pull from the one place.
Also, its easy from me to catch in the next step, but it would be nice if I can trim the CDROM device count down to 1 after setting up system. VM Tools and OS Media ISOs in the builder leave the resulting system with 2 CDROMs.