so what about the ability to use frames as states for mirroring?
You can if you like - it's just boring importing the same frames and mirroring them, and then you have twice as many animation frames that have to be downloaded. The auto-mirror is mainly to save on download size, really (and for convenience).
hen can i asume to be able to use the tool in the sprite import window correctly?
Sorry, I'm not sure I understand what you mean. Is something not working?