Audio Mixdown autofade

It would be cool to have the option in File/Export/Audio Mixdown window to automatically fade in and/or fade out the exported audio. This would save time if you select excerpts of a project that you want others to listen to for a partial playback. You can of course do that with the numerous fade functions but the problem is that it takes time and also that you need to remove it once you exported the mixdown.
2 simple checkboxes for both fade in and fade out would do the job. You could also add a time value editor for the fades but honestly for this application a fixed 5s logarithmic (for instance) fade value would be ok.