I’m completely new to Rhino and might be completely wrong about this. Having seen gumball in action at YouTube I gave it a try.
A: To move a surface I’ll just drag one of the axis arrows, works great.
B: To move a distance I’ll enter a number and press enter, works great.
C: To create a solid out of a surface I’ll hold down Cmd-key (not ctrl as on Windows), works great.
D: But, how do I create a solid with a thickness of an entered number?
First try: Drag arrow, enter number, press Cmd, release mouse -> suprisingly, this seems to be the same as ©
Second try: Drag arrow, enter number, press Cmd, press Enter -> nothing happens