Is it permissible to prostrate or pause for Tasbih when reciting verses that indicate the greatness of Allah, even if there is no prescribed prostration point?

What you are doing by prostrating during recitation in a place where prostration is not due is not permissible; rather, it is an innovation (bid‘ah), because it is an action without a cause, and every innovation is a misguidance. As for pausing the recitation to glorify Allah (tasbih) if you pass by a verse containing glorification, that is legislated.