Yes that´s possible. 3DGS is a game engine like Unity or or Torque, so most of what you can do with these engines is also possible with 3DGS. Check out the official Gamestudio Trailer showing some of the projects made with 3DGS: http://www.youtube.com/watch?v=w3uw0e5y4nE
Oh, and check out the Gamestudio Wiki: http://www.opserver.de/wiki/index.php Lots of Tutorials, Tools and of course user projects there. That`s maybe a better start than the forum.