You need to be carefull about jumping your motorcycle's battery. The amperage of the car you are jumping from can be too high for the bike and damage the circuitry.
You can buy an accessory port cable for a battery tender and use it to hook the positive cable too.
Jumping off a car battery is perfectly safe, your bikes starter will only use the amps it needs. You just have to be carefull about keeping the polarity right and disconnect the cables asap so that the cars alternator doesn't blast your little battery with its 100 amp (on average) capability(I would suggest jumping with the cars engine off). I thought that you could get the parts from bmw to install remote jumper lugs.
Is there such an animal as the jumpstart kit that plugs directly into the cigarette lighter/power plug? I had my Rockster retrofitted with the jumpstart positive plug. I also have a RoadGear.com cable that I carry with me on extended trip. This jumper cable is very compact and light.
My Rockster came with all of the above listed goodies, including a jumpstart node on the frame? Did the older ones not. I also have a little set of cables with a circuit breaker from the local autozone.