It appears that the Texture Packer dialog does not remember my last output folder. Input folder and Atlas name are remembered correctly, however output folder is always set back to the last input folder.
Reproduction steps:
Open the Texture Packer dialog (Ctrl+P).
Set an output folder that is different from the input folder.
Click "Pack" or "Cancel"
Open the Texture Packer dialog again (Ctrl+P).
It would be nice if this would work as I imagine it should by remembering my last output folder. That way, if I make any changes to the input images, I can just press Ctrl+P then Enter to update my texture atlas. Thanks for your consideration.