I just DLed the game, built a new computer, loaded the game up, fired up the tutorial and...
The game requires a scroll wheel. Indeed, you can't get past a certain part of the tutorial without one. Since I lack a scroll wheel on my trackball (and don't want one anyway), this is a problem...
Is there another way of zooming in? If not, I can say that Homeworld faced the same problem and decided to allow zooming by pressing and holding both mouse buttons while moving the mouse ball. Alternately, letting me use the page up, page down buttons (I think GalCiv2 does this) would be next best...