The problem
When setting up a new OES box you need to select the container to put it in, but the selection options make you scroll all the way through all the leaf objects(which aren't applicable) before you can select an applicable container as they are at the very bottom.
The Fix
I would imagine it should be easy to just show container objects as that is all we need to see at this level. alternatively just making sure the containers are at the top of the sort order before a secondary sort of alphabetical.
There are a number of other places where this sort of thing shows where even if you want a leaf object, you have to go to the bottom to select the context before getting to the object. So if we can fix the underlying code for this, we should be able to help many other places within OES.