Adds a "crossfade selection" option to the context menu for scene strips that allows you to apply a simple crossfade effect to all selected audio strips. Support for video cross-fading my come in the future.
WARNING: This add-on is extremely simple and bare-bones at the moment. You must have the playhead to the right of all effected files in the current version.
https://github.com/Ch-byte-afk/Blender-VSE-Add-On-Group-Crossfade/releases/tag/Release