The best way to have no automatic ending is to create one yourself.

BB will have to end the song one way or another. So, add as many measures as you need and use that space to end the song in whatever way you want.

I have done my own endings on a number of songs and it works well.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.