Spotify playlists: Add search suffix (e.g.) to download only extended mixes

I use the Youtube to MP3 converter to download Spotify playlists to my local device.
I would like to request the following feature:
While the converter tries to find the correct Youtube Links for the Spotify tracks, it would be very helpful to have the possibility to add a "search suffix".
What I mean by that, is that the user can enter (globally in the settings) a custom string, that gets added to each search.
This would be extremely helpful to download only extended versions of the tracks if they are available.