Using the PlaySoundFile API function, we can play sounds using paths instead of IDs, which allows for custom sounds as well (when they're present). We can either use the same effect and allow both IDs and paths, or have a different effect if it sounds more desirable.

File paths are not usable anymore, so it would rely on file IDs, and it could be a simple case of having a dropdown to choose between sound ID and sound file ID (with clarification about where to find either of them in the tooltip).