For recent project I have found myself needing to duplicate an interaction and change targets for classes, or when animating a complex illustration having to reposition elements for various interactions. 

In this instance I don't view designer instead spend most of the time in Navigator and Interactions, I would love to be able to organise my interactions and work on the in isolation so maybe have the list of them on the right then in designer updated my interactions there.

Let's say I'm making a custom slider with 7 slides. 

I need to create an interaction for each slide to reposition elements, clicking out and in and retargeting is a pain in such a small space. also add the plus to the bottom not top, it's frustrating to keep scrolling up when adding a new element to the interaction :)