Hi, I have one monitor, so I couldn't try it. But I searched it for google and I learned some tricks. I have changed source code for the focusing the screen that has the mouse cursor. Please download v1.1. It must work now. Don't forget to close and delete old one before start the new version, please.
By the way, I don't know how to make it work at two or more screen at the same time. But if it works on the your focused screen, it probably help to fix your usability problem.
I would appreciate if you inform me about the results.