I were to make a row of ellipses or polygon stars for instance and I decide later to change it to another shape, while retaining all of the parameters (repeaters, size, fill etc.) how do I just change the shape? I can't figure it out for the life of me.
if you started off with a polygon or star shape, under the polystar path properties you can change the number of points and roundness so you can effectively create any equilateral shape from that type of shape path -- you could also use transform properties to scale it in one direction or the other to make rectangles, ellipses, etc.
if you started with a different shape path, you can add another shape to that layer and then copy/paste the other properties onto the new shape.