hey, it seen FP more buggy than excepted, due the script just wait for FP window to close, which it propenty never do correctly (also its might been a new exit bug in FP). I think I should fix that one in the script. Anyway you did it to run without it. Here I did not have any exit problem, but think a waitkey should been added to the script, so the script would countinue.
EDIT:
I actuelly wrote which Quit key you was actuelly using, since it need to been changed in the script.... and not the actuelly ESCAPE (due you wrote you can't use it directly with your cab controls).
Future Pinball Exit on Escape key itself and normally goes back to the pinball editor, and hence the script is just checking and waiting for FP closedown the gameplay window and then the script closedown the editor window too. That is what the script does. The script can been moded to checking when pressing the quit key you use and send a ESCAPE stroke to FP.