Also, from Ultimarc's website:
"The new shift button functionality works like this:
Button 8 is the shift button
This button has its normal function, unchanged
In addition to its normal function, when held down, it will activate "virtual buttons" 9-15. Any other buttons pressed will register as 9-15 instead of 1-7.
In MAME you might wish to configure, for example, button 9 as "coin". Then holding button 8 and pressing button 1 will generate the "coin" signal.
You can test all button functions by going to Control Panel, Game Controllers, Properties."