Hi,
Sorry, but currently this is the default layout (mimicking the layout of the multi-lookup column when using side-by-side layout in DFFS Misc tab).
It should however not be a big problem to add support for using “default” layout if this is required.
If you want to give it a try, you can fix it by changing the table layout in line 156-175 in the spjs-casc.js script.
Alexander