I want to install the following control in my cabinet:
Standard inputs about 50 (5 joysticks...loads of buttons)
1 Trackball
1 push/pull spinner
2 spinners from a Forgotten Realms game.
My questions are, with only a KE72T i can use the trackball and push pull spinner, right?  If i get an OptiPac as well can use the other 2 spinners for a total of 5 optical devices?  Will a ke72T and optipac coexist without issues? 
Any help will be greatly appreciated.  My project is nearing the end, i just have to start mounting and wiring controls, but the multiple spinner issue has me confused...i know i can't do it with just the ke72t...what else do i need?  Thanks!
Hudson