Hi JL82 - MoI version 3 has a draft angle function within the Construct > Extrude command, it's the "Tapered" option in Extrude.

After you have selected a curve or face to extrude, run the Construct > Extrude command and then push the "Tapered" button, then an option for setting the draft angle will show up in the command options area.

More details on Extrude here:
http://moi3d.com/3.0/docs/moi_command_reference7.htm#extrude

- Michael