(Some thoughts from a newbie arcade controller builder)
1. Would really rock, be interested in that.
2. Would be very nice, I think I'd even pre-order that if it came down to pre-orders to get the funds to manufacter.
3. While interesting, I think I'd end up passing on this one, because for me I'm interested in what supports the widest possible range, and am using 49-ways. Down the road, when I get more adventurous and start doing modular panels, this would be a definite buy, and I guarantee it would be a hit product especially if more support was available.
4. Would be a "Must buy" along with 1 and 2, and another I'd pre-order.
Some other thoughts, from a "Newbie".
5. An easy to use USB LED part. I've looked at the current offerings, and they are most certainly usefull, but they all seem to have the drawback of requiring extensive knowledge to use properly. I'm electrically clueless and would be interested in a version that you just wire everything in to obvious ports without having to worry about capacitors(Resistors?).
6. Would be very nice if some form of "LED" type display board could be built that mount on top of or nearby a cabinet that would display current scores and hi-scores, similiar to the one used by Dragon's Lair. Wired in USB.
7. Shifter, haven't seen many/any models out there.
8. (Really wishfull thinking) Prebuilt modular interface. IPAC would wire into a female end and each panel would wire into a male end, with some manner of identifing each panel in the male end such as a "Master set of pins". Would then just be a matter of unplug/plug. Think of it kinda like an IDE cable, where the first, say 8 positions would be used to identify the panel, and then the remainder would be used to wire in each controller. I don't even know if it would work, or if it could be done, just thinking here on what could be usefull.