This would allow a user to manually browse for a subtitle file in the share or library folder structure when Infuse is not able to load an appropriate subtitles, in such cases as:
-when the subtitle is not embedded in the media
-when the subtitle does not follow correct naming convention / is named differently than the media
-when subtitles are collected in a subfolder
etc
This would unburden the user from managing tens-hundreds of subtitle files in the case of series for example, and would allow simple navigation to a subtitle file, on-demand, when required, while playing the media.