Ahh, I was so busy with locating the cursor, that I wasn't sure, if the plugin would take care of both. With version 1, I had the SMPTE code set up. It works pretty awesome, now.
I still have no idea, what the keyboard has to do with the issue (using "Move edit cursor to mouse cursor"and scrubbin very fast with the mouse does not cause erratic behaviour). But I take it as it is and I'm very happy
Thanks a lot mrlimbic!