@workinChris You can still extrude a selection by holding Ctrl-PC and Command-Mac and then using the arrow keys to direct the extrusion.
You can learn more about it here: http://minddesk.com/learn/article.php?id=105&oid=27
I suggest also reading everything in the "Learn" database, like read everything (it won't take that long). You can find the main database here: http://www.minddesk.com/learn/
If you have any other problems, that cant be resolved by reading the "Learn" database or cant be solved on this forum, then I suggest contacting the developer here: http://www.minddesk.com/contact.php
Good luck! I hope I helped: