You can cancel auto sweet spotting the ledge by holding down.

[Davis-Lightheart]

Not sure if this was in Brawl or not, but someone found that you can cancel Auto-sweet spotting by holding down.

http://gfycat.com/NearJauntyIvorybackedwoodswallow

I thought it was a neat detail to share if no one knew.

 

[-RedX-]

Yep, was in Brawl.
I think it will be more important in this game against players who know how to use ledge trump mechanics to get free followups.