You bet! Just using PgUp and PgDown will let you smooth-scroll in and out with the keyboard. I imagine that playing most any RTS game would be wicked difficult without a mouse, but it certainly can be done. If you're interested in a fuller list of keyboard shortcuts and the like, be sure to check out the end of the game manual, or open the game settings window and click the View Controls button. You can also get to View Controls from in the in-game menu (where you save your game, basically).
Hope that helps!