rpoenaru,
The issue isn't that VMWare Motion causes issues with the software itself, really. The reason we do not support it is because when you move a virtual machine from one server to another, the hardware it uses changes, thus its magic number changes.
The same thing happens if you install PlanetPress in a VMWare Workstation guest, activate it and then move the virtual machine to another physical computer.
Perhaps someone in development or marketing can advise further but, as far as I know, there is no plan to support VMWare Motion in the near future (thus no timeline for it).
Regards,
Eric.