I would love to be able to insert a new plug-in at any point in an existing chain of plug-ins without having to move them all manually to make a space! And let's make sure the automation follows the new positions of it's designated plug-ins.
load the new plug-in at the bottom, and then drag it to where you want it... you'll see a little line inbetween two inserts that squeezes it in. must admit, i used logic for a good few months before realising this. and automation data should update too