The plus or minus keys did not work for me, either the standard keys or those on the num pad. Hopefully hotkeys will be implemented in the full game (unless I just missed something in the demo).
I have a Logitech Mouseman Wheel, but the wheel does not work to scroll in the demo unless I exit the controller software (which handles double clicks, and other non-standard functions assigned to buttons), by hitting ctrl-alt-del, then ending the "em_exec.exe" task.
