I should have said that the cabinet I plan to put this in has swappable panels...one has sticks/buttons/spinner and the other is trackball/buttons.
The spinner has a USB interface and and the trackball obviously has a PS/2 interface...if I can swap the panels by connecting to the minipac only, rather than unplugging the PS2 and rebooting, that would be preferable.
I've just realized that the connectors on the minipac are actually 1/4" and so I probably won't get that for that reason. This strikes me as an odd choice, given that most microswitches on arcade panels (andleaf switches too, for that matter) have 3/16" connections. Maybe the idea is to accomodate all switch types? How about a 3/16" version as an option?