CJK, you were asking about conflicts with spinner and trackball...to this point, I've had none of note. The only thing to mention is that I find the left trackball / mouse button will work as a fire button for the spinner, though the two are not connected in any way, shape, or form on the underside of my panel. Guys, I thought I was computer savy, but I have to admit I have NO idea how that one worked out. It's not in an Opti-Pac or IPAC, this "just happened" as far as I can tell.
Oh, I know there's a reason for it, but I have no idea what! Again though, that's been the only thing I've encountered so far!