I want to offer a new API method - import. It'll similar "multi search". The input is list with string-item and output is "search result" for each item.
I am developer app for transfer music from Yandex to Spotify. In my case, these is using search request for each item. It often raises error of "too many requests". With the new method, many of separate request for search convert to the one request import.
And you can add text-area to site. In order to users can import their list of tracks and create playlist with it.