The only issue with that is the same drawback as with the plugin. You can't click them both at the same time (at least not as is).
Yup Burvey you are right and that won't work for my pinball game but might help people wanting to use shift keys for other games.
I switched to Left Shift and Control for my game and that works well.
Just so people know- not all keys are fast repeating keys like the arrow keys and they have a built in lag after you press so if you want to use fast repeater keys the shift and control and tab keys are fast repeaters for games.
If you want to hold a button down with no lag time after the first press use those keys.