I was going to post on here that we really need to have a way of globally editing all instances. It is obvious that you can select all instances of an object by left click selecting it in the object/project pane and then adjusting the variables/parameters you need.
What is not so obvious, is that if you right click an object in the object/project pane (disregard the right click menu that comes up) you can then change any parameter/variable in your whole project!
It is great to be able to change parameters on either a single instance, all layout instances, or all project instances at will. Gives you a massive amount of control and freedom. Wish I knew about this a few months back :)
Not sure if this is documented or well known, but hopefully someone else finds this useful