Currently, we must use the Rectangular Pattern tool to create a circular pattern if the orientation of the patterned feature is not meant to rotate.
Using the Rectangular Pattern tool for a circular pattern is not discoverable to new users leaving many of them to conclude that this is a limitation of Inventor. Additionally, the selections required to do this in rectangular pattern are a bit involved for the user who only finds the need to do this occasionally.
Adding an option to the Circular Pattern tool would help.
Related post:
http://forums.autodesk.com/t5/Autodesk-Inventor/Cutting-slots-and-maintaining-orientation/td-p/38198...
