TexturePacker: How to prevent tpsheet from being created?

I’m using TexturePacker to put together my sprite sheets, but every time I publish an updated sprite sheet, it produces a .tpsheet file which overrides any trimming and pivot points I changed before I updated the sprite sheet.
I really don’t want to have to redo all the pivot points every time I decide to add a sprite to the sheet.

Is there a solution to this?

The newest Unity importer for TexturePacker now contains an option to only import new sprites.
This allows you to change the pivot points inside Unity’s sprite editor.

The setting is under Unity->Edit->Preferences

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