It would be nice to be able to make sure your Plot Object is actually in the centre of the Plot Item rectangle in the Layout. I would like to see some form of guideline. Either a centre guideline or a cross (see image) would do. If you want to insert multiple Plot Object and make sure they are aligned it is very hard to do at the moment. This is the case for booms, multiple bridges close to each other, different scenes on the same floorplan, etc.