I don't know for sure... But, I don't think you can edit the 2 bar endings. I have tried a few times to get them to do certain things and they never do what I want.

PG made the 2 & 4 bar default endings since they will easily fit most of the common song ending that people may want to use. But, there's always the exceptions, and the default ending will not work in those cases.

So.... you can always turn the 2 or 4 bar ending off and make your own ending. Just turn the ending off and then add a number of additional measures/bars to the end of the song.

Use the part markers and holds on instruments to do exactly what you want to get your exact, perfect, ending.

I have used this method several times. It works great and really doesn't take very long to set up, because we all know, that one size doesn't fit all.

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.