It seems unlikely that I will be able to figure out how to generate correct "Creator" handles without investing considerably more research time. As such, the "Add Item" feature may be removed entirely. We'll see.
If I don't include this, the only other things I would like to include would be:
mod template selector (to replace the "Icon" button in the item editor)
Between "Add Item" and "Import/Export" I'd choose the latter, I'd say go for it.