Hi, MT Pro never swallows incoming key actions. The are always passed through to the currently focused application. If you open a text editor while pressing Q and D you will see this. It does not show in MT Pro because MT Pro is not passing the keystroke. The operating system is handling it directly.
Regarding your mouse movement, I just put a 50ms delay on outgoing action of your two translators and everything works fine. I suspect the operating system needs a bit of time to process the keystroke first before handling the mouse wheel action.
Steve Caldwell
Bome Customer Care
Also available for paid consulting services: bome@sniz.biz