Currently the Epic Illusion summon is rather useless. The associate tool is very difficult to navigate with and the summon frankly just has very few uses and they are extremely limited.
Even if the summon was only able to be possessed in the 'Area' or room that your character was in, or only up to a certain range, being able to control the summon with WASD like you can PC's and Familiars would make it infinitely more pleasant to operate and more useful!
It's an awesome mechanic and we'd love to see more options available for using it, even if they were still mostly limited due to balancing constraints some improvement would be great to see.