The current behavior of adding transitions to both video and audio (and then delete the video transitions) is a huge pain, and a hopelessly inefficient way to work.

I use a lot of audio transitions, but I almost never want video transitions. Please let us get an easy way to add audio transitions without having to spend time on the meaningless task of deleting video transitions.

No, separating the audio to a new track is not a good option.
No, adding video transitions and deleting them is not a good option.

Yes, adding Audio only transitions IS a good option.