when adding a new qvd in script editor, there are two options:
You can add the file by click on datafiles in a stream, then popup a window where you can see all the files in. But no filtering or search is possible.
If you are using add from data catalog, you can search or filter the files, but when using a qvd, you can't select the fields you want to load.
The union from both (search in file list and select needed fields) would be nice.