I use an Android app called EXIF Notes to record relevant metadata for my valuable shots (not everything), and it exports CSV (as well as a batch file to automatically apply the data using EXIFTools, which isn’t suitable for use with RAW files, of course). So an option to import structured metadata into NLP extended metadata panel would be helpful. But seeing as Nathan is the sole developer, I’d rather he spent his time on the core functionality 
Of course, if he gets some spare time during a vacation… 