I believe they are standard plugs, but I could't figure out which ones you'd need (and I didn't fancy acquiring the tool for wiring them at the time, anyway).
I'm sure I've seen a post on here somewhere from someone who could identify the plugs and even posted a link - but I can't find it (didn't look too hard though, I'm at work!)
Whether BKP want to provide it as an option though... could be fraught with difficulties, even for the people it might help (there's the "how long do you want the pickup cable to be?" question for starters)