Thank you for your reply.
I know I'm probably in the minority, but after 30 years of inverted gaming, I would rather not try to adapt to non-inverted ;).
If you can find a solution for BID, I would appreciate that very much.
Tools would work, but they also reverse the mouse curser movement in the menu :/.
I read somewhere that it can be configured in the unity-editor. Also, I found registry-entries of other Unity-games (ex. Huuma Mina or Cinderella Escape 2), where I was able to reverse the vertical movement. Sadly, your games does not have such entries.
But, I'm looking forward to any news on this topic. Thanks again.