I would like to have added to the Offset command a Repeat Offset feature. Here is the breakdown of how it would work;
In Sketch environment select Offset.
Select the parts of design you wish to Offset
Click a checkbox on the Offset Dialog Box
New Fields appear asking for number of times to repeat offset of selected design elements
Offset distance determines spacing between offsets.
This would greatly speed up making repeating cascading or radiating patterns.