Much appreciation for the offer.
My cp hasn't quite yet been built and sent to me. Mameroom.com is doing a custom one per my design and I won't learn how they've wired it up to the i-pac until I receive it, though there is still time for me to request certain mapping preferences. Any suggestions? I believe I recall being informed that the spinner will be on the x-axis, and I am okay with PgUp/PgDn, but would that require the i-pac to offer those keys? I am not yet familiar with any of its mapping capabilities.
However, because I will have both a trackball and spinner, after thinking it through further I figured perhaps the trackball would be the better bet, seeing as I am right handed and my trackball will be on the right side (spinner a bit left of center). Spinner would otherwise be my ideal choice, but trackball should work well enough, as per your own experience. Should I assume that rolling the trackball towards me (down?) would cause the names in the wheel to move up (list advancing alphabetically)? I'm using the Nevato theme, in case that matters.
Assuming AM sees both spinner and trackball as mice, then in case I might like the option to try switching back and forth between the spinner and trackball on the fly (both active at the same time even better) for this purpose, could that be achieved by having the spinner set to the y-axis, and if so, what are the caveats of having it on y instead of x, with respect to game play in mame? (e.g. Would Arkanoid still play normally, etc.)
And lastly, would any of this negate the ability to simultaneously retain having a joystick up/down move one at a time?