Transform Effect with manually adjustable anchor position
The current Transform Effects has a very limited anchor position setup (that 9 squares in the bottom corner). To make a custom anchor position, we must input "horizontal" and "vertical" value manually which is very ancient.
Rotation tool with Transform Again method is an alternative when creating a mandala thingy, but it if we want to alter the shapes, we have to repeat the rotation and transformation again, which is another ancient stuff.
Adding a simple clicking right on the artboard for placing the anchor point of Transform Effects would be great. We can just set up the anchor point first manually (just like the rotation and transform again method), and then the Transform Effects follows where the anchor point is placed. This will be removing the labour of manually inputting the value of horizontal x vertical of the transformation.
You can use workaround with invisible larger object grouped with your art, with a center in a point you need.
Adjustable anchor position would be great though, but it won't be easy in many ways: to set absolute coordinated but store them as relative offset? What will happen if you move your art then or change dimension or art itself? Needs a lot of thinking, while dummy trick already works.