Just finished #224, and during the eBay items segment, the discussion about the Hyper Electronics Apple "Mouse" item was one I found to be particularily interesting.
I tried to look at the item, but it had already sold. The pictures seem to be rediculously low resolution for today's standards. But it seems that there is a two pin header on the board. My guess is that is for an extension wire to an externally mounted switch to use in combination with a key stroke to trigger the macro.
This is very reminicent of many Taiwanese ][+ clone keyboards, which had macros, and they were also printed on the front face of the keycaps so the user can see what each macro was associated with which key. The modifier key was located in the 'Power Light' location.
I always that that was a cool feature back then.
I just bought the one without the packaging, so I won't have a guide on what macro would be associeated to which key, but I suppose I could always plot them into a spreadsheet for reference.