Virtual mass

I am a bit confused about virtual mass. I've found out the following through experimentation with spaceballs:

1) Virtual mass does not count in the info tab in the terminal window, but the base mass (regular mass) does.

2) When using the .Mass property through scripting, the base mass is ignored (which I think is very weird)

3) There is also a .VirtualMass property, which gives the same as .Mass for a spaceball. That seems pointless. So if you set the virtual mass to 100, both...

Virtual mass