Thank you for your reply!
First, I want to say that the Pinball Template is totally awesome. I am now playing around with it and all the code is totally clear and the mechanics are working great. So thank you!
I finally solved the Pause feature by just putting Delta time to 0! It was finally quite easy! To sum up the code: Syste: On clicking Pase Button --> System: set time scale to 0. Then, for returning to Pause we set the time scale again to 1.
It's working fine, no bugs so far