For what it's worth, I drive 95% of the time now with VSP off -- it's a habit to turn it off when backing out (I hate that dinger!) but 95% of my driving is also on the freeway -- when it's off, anyway. Any time I'm around pedestrians - in shopping center parking lots or downtown where pedestrian-vs-vehicle is all too commonplace, I almost subconsciously turn it back on.
My mod is much less elegant -- just a red pushbutton installed into a blank button plate with a hole drilled in it for mounting. I dubbed (and labeled) it the "STFU button".
Behind the dash, it's a single wire running behind the panels to the VSP box, where I soldered it to the pin and passed it over the connection housing, since I had no idea where to get the connector.
On the switch end, I have the second lead running to the frame nearby, a good ground connection.
Really makes me think that $120 mod option earlier is worth it - it looks perfectly stock, and functions as if it may as well be!