And all Windows RT devices also have WiFi networking built in... so it's ok to limit one kind of device but not another? Interesting double standard you have there.
If someone bought a Surface, it's their device and they can install whatever they may wish. I know, not very cool to say this in today's prison IT.
Tell that to those who try to install third-party apps to a Surface outside of the Windows 8 store.
Sure it's doable with a bit of work. Ditto goes for an unsupported Ethernet adapter.