Enable or Disable Key Exposure

It would be great if you could disable or enable this behavior.
Because when you are doing lip sync and swapping drawings it’s awesome.
But in other tasks this is so annoyng.
The “remove duplicate key exposure” helps, but still… I think it should be toggleable.

Preferences > Timeline - Drawing Substitution [x] Create Key Exposure. If you uncheck this box, does it do what you want?